[29] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> |
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| 2 | <html> |
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| 3 | <head> |
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| 4 | <title>Boost.Regex: Index</title> |
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| 5 | <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> |
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| 6 | <link rel="stylesheet" type="text/css" href="../../../boost.css"> |
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| 7 | </head> |
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| 8 | <body> |
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| 9 | <P> |
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| 10 | <TABLE id="Table1" cellSpacing="1" cellPadding="1" width="100%" border="0"> |
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| 11 | <TR> |
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| 12 | <td valign="top" width="300"> |
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| 13 | <h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../boost.png" border="0"></a></h3> |
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| 14 | </td> |
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| 15 | <TD width="353"> |
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| 16 | <H1 align="center">Boost.Regex</H1> |
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| 17 | <H2 align="center">Concepts</H2> |
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| 18 | </TD> |
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| 19 | <td width="50"> |
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| 20 | <h3><a href="index.html"><img height="45" width="43" alt="Boost.Regex Index" src="uarrow.gif" border="0"></a></h3> |
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| 21 | </td> |
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| 22 | </TR> |
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| 23 | </TABLE> |
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| 24 | </P> |
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| 25 | <HR> |
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| 26 | <p></p> |
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| 27 | <H3><A name="charT"></A>charT requirements</H3> |
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| 28 | <P>Type charT used a template argument to <A href="basic_regex.html">class template |
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| 29 | basic_regex</A>, must have a trivial default constructor, copy constructor, |
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| 30 | assignment operator, and destructor. In addition the following |
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| 31 | requirements must be met for objects; c of type charT, c1 and c2 of type charT |
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| 32 | const, and i of type int:</P> |
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| 33 | <P> |
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| 34 | <TABLE id="Table2" cellSpacing="1" cellPadding="1" width="100%" border="1"> |
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| 35 | <TR> |
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| 36 | <TD><STRONG>Expression</STRONG></TD> |
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| 37 | <TD><STRONG>Return type</STRONG></TD> |
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| 38 | <TD><STRONG>Assertion / Note / Pre- / Post-condition</STRONG></TD> |
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| 39 | </TR> |
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| 40 | <TR> |
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| 41 | <TD>charT c</TD> |
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| 42 | <TD>charT</TD> |
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| 43 | <TD>Default constructor (must be trivial).</TD> |
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| 44 | </TR> |
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| 45 | <TR> |
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| 46 | <TD>charT c(c1)</TD> |
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| 47 | <TD>charT</TD> |
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| 48 | <TD>Copy constructor (must be trivial).</TD> |
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| 49 | </TR> |
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| 50 | <TR> |
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| 51 | <TD>c1 = c2</TD> |
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| 52 | <TD>charT</TD> |
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| 53 | <TD>Assignment operator (must be trivial).</TD> |
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| 54 | </TR> |
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| 55 | <TR> |
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| 56 | <TD>c1 == c2</TD> |
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| 57 | <TD>bool</TD> |
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| 58 | <TD>true if c1 has the same value as c2.</TD> |
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| 59 | </TR> |
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| 60 | <TR> |
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| 61 | <TD>c1 != c2</TD> |
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| 62 | <TD>bool</TD> |
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| 63 | <TD>true if c1 and c2 are not equal.</TD> |
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| 64 | </TR> |
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| 65 | <TR> |
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| 66 | <TD>c1 < c2</TD> |
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| 67 | <TD>bool</TD> |
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| 68 | <TD>true if the value of c1 is less than c2.</TD> |
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| 69 | </TR> |
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| 70 | <TR> |
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| 71 | <TD>c1 > c2</TD> |
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| 72 | <TD>bool</TD> |
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| 73 | <TD>true if the value of c1 is greater than c2.</TD> |
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| 74 | </TR> |
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| 75 | <TR> |
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| 76 | <TD>c1 <= c2</TD> |
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| 77 | <TD>bool</TD> |
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| 78 | <TD>true if c1 is less than or equal to c2.</TD> |
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| 79 | </TR> |
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| 80 | <TR> |
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| 81 | <TD>c1 >= c2</TD> |
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| 82 | <TD>bool</TD> |
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| 83 | <TD>true if c1 is greater than or equal to c2.</TD> |
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| 84 | </TR> |
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| 85 | <TR> |
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| 86 | <TD>intmax_t i = c1</TD> |
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| 87 | <TD>int</TD> |
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| 88 | <TD> |
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| 89 | <P>charT must be convertible to an integral type.</P> |
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| 90 | <P>Note: type charT is not required to support this operation, if the traits class |
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| 91 | used supports the full Boost-specific interface, rather than the minimal |
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| 92 | standardised-interface (see traits class requirements below).</P> |
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| 93 | </TD> |
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| 94 | </TR> |
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| 95 | <TR> |
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| 96 | <TD>charT c(i);</TD> |
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| 97 | <TD>charT</TD> |
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| 98 | <TD>charT must be constructable from an integral type.</TD> |
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| 99 | </TR> |
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| 100 | </TABLE> |
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| 101 | </P> |
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| 102 | <H3><A name="traits"></A>traits requirements</H3> |
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| 103 | <P>There are two sets of requirements for the traits template argument to |
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| 104 | basic_regex: a mininal interface (which is part of the regex standardization |
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| 105 | proposal), and an optional Boost-specific enhanced interface.</P> |
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| 106 | <H4>Minimal requirements.</H4> |
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| 107 | <P>In the following table X denotes a traits class defining types and functions |
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| 108 | for the character container type charT; u is an object of type X; v is an |
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| 109 | object of type const X; p is a value of type const charT*; I1 and I2 are Input |
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| 110 | Iterators; c is a value of type const charT; s is an object of type |
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| 111 | X::string_type; cs is an object of type const X::string_type; b is a value of |
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| 112 | type bool; I is a value of type int; F1 and F2 are values of type const charT*; |
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| 113 | and loc is an object of type X::locale_type.</P> |
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| 114 | <P> |
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| 115 | <TABLE id="Table3" cellSpacing="1" cellPadding="7" width="100%" border="1"> |
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| 116 | <TR> |
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| 117 | <TD vAlign="top" width="28%"> |
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| 118 | <P><STRONG>Expression</STRONG></P> |
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| 119 | </TD> |
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| 120 | <TD vAlign="top" width="28%"> |
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| 121 | <P><STRONG>Return type</STRONG></P> |
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| 122 | </TD> |
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| 123 | <TD vAlign="top" width="45%"> |
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| 124 | <P><STRONG>Assertion / Note |
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| 125 | <BR> |
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| 126 | Pre / Post condition</STRONG></P> |
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| 127 | </TD> |
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| 128 | </TR> |
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| 129 | <TR> |
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| 130 | <TD vAlign="top" width="28%"> |
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| 131 | <P>X::char_type</P> |
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| 132 | </TD> |
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| 133 | <TD vAlign="top" width="28%"> |
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| 134 | <P>charT</P> |
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| 135 | </TD> |
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| 136 | <TD vAlign="top" width="45%"> |
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| 137 | <P>The character container type used in the implementation of class template <CODE>basic_regex</CODE>.</P> |
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| 138 | </TD> |
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| 139 | </TR> |
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| 140 | <TR> |
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| 141 | <TD vAlign="top" width="28%"> |
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| 142 | <P>X::size_type</P> |
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| 143 | </TD> |
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| 144 | <TD vAlign="top" width="28%"> |
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| 145 | <P> </P> |
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| 146 | </TD> |
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| 147 | <TD vAlign="top" width="45%"> |
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| 148 | <P>An unsigned integer type, capable of holding the length of a null-terminated |
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| 149 | string of charT's.</P> |
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| 150 | </TD> |
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| 151 | </TR> |
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| 152 | <TR> |
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| 153 | <TD vAlign="top" width="28%"> |
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| 154 | <P>X::string_type</P> |
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| 155 | </TD> |
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| 156 | <TD vAlign="top" width="28%"> |
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| 157 | <P>std::basic_string<charT> or std::vector<charT></P> |
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| 158 | </TD> |
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| 159 | <TD vAlign="top" width="45%"> |
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| 160 | <P> </P> |
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| 161 | </TD> |
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| 162 | </TR> |
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| 163 | <TR> |
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| 164 | <TD vAlign="top" width="28%"> |
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| 165 | <P>X::locale_type</P> |
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| 166 | </TD> |
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| 167 | <TD vAlign="top" width="28%"> |
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| 168 | <P>Implementation defined</P> |
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| 169 | </TD> |
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| 170 | <TD vAlign="top" width="45%"> |
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| 171 | <P>A copy constructible type that represents the locale used by the traits class.</P> |
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| 172 | </TD> |
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| 173 | </TR> |
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| 174 | <TR> |
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| 175 | <TD vAlign="top" width="28%"> |
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| 176 | <P>X::char_class_type</P> |
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| 177 | </TD> |
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| 178 | <TD vAlign="top" width="28%"> |
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| 179 | <P>Implementation defined</P> |
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| 180 | </TD> |
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| 181 | <TD vAlign="top" width="45%"> |
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| 182 | <P>A bitmask type representing a particular character classification. Multiple |
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| 183 | values of this type can be bitwise-or'ed together to obtain a new valid value.</P> |
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| 184 | </TD> |
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| 185 | </TR> |
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| 186 | <TR> |
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| 187 | <TD vAlign="top" width="28%"> |
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| 188 | <P>X::length(p)</P> |
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| 189 | </TD> |
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| 190 | <TD vAlign="top" width="28%"> |
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| 191 | <P>X::size_type</P> |
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| 192 | </TD> |
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| 193 | <TD vAlign="top" width="45%"> |
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| 194 | <P>Yields the smallest <CODE>i</CODE> such that <CODE>p[i] == 0</CODE>. Complexity |
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| 195 | is linear in <CODE>i</CODE>.</P> |
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| 196 | </TD> |
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| 197 | </TR> |
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| 198 | <TR> |
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| 199 | <TD vAlign="top" width="28%"> |
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| 200 | <P>v.translate(c)</P> |
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| 201 | </TD> |
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| 202 | <TD vAlign="top" width="28%"> |
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| 203 | <P>X::char_type</P> |
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| 204 | </TD> |
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| 205 | <TD vAlign="top" width="45%"> |
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| 206 | <P>Returns a character such that for any character d that is to be considered |
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| 207 | equivalent to c then v.translate(c) == v.translate(d).</P> |
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| 208 | </TD> |
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| 209 | </TR> |
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| 210 | <TR> |
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| 211 | <TD vAlign="top" width="28%"> |
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| 212 | <P>v.translate_nocase(c)</P> |
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| 213 | </TD> |
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| 214 | <TD vAlign="top" width="28%">X::char_type</TD> |
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| 215 | <TD vAlign="top" width="45%">For all characters C that are to be considered |
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| 216 | equivalent to c when comparisons are to be performed without regard to case, |
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| 217 | then v.translate_- nocase(c) == v.translate_- nocase(C).</TD> |
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| 218 | </TR> |
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| 219 | <TR> |
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| 220 | <TD vAlign="top" width="28%"> |
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| 221 | <P>v.transform(F1, F2)</P> |
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| 222 | </TD> |
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| 223 | <TD vAlign="top" width="28%"> |
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| 224 | <P>X::string_type</P> |
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| 225 | </TD> |
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| 226 | <TD vAlign="top" width="45%"> |
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| 227 | <P>Returns a sort key for the character sequence designated by the iterator range |
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| 228 | [F1, F2) such that if the character sequence [G1, G2) sorts before the |
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| 229 | character sequence [H1, H2) then v.transform(G1, G2) < v.transform(H1, |
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| 230 | H2). </P> |
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| 231 | </TD> |
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| 232 | </TR> |
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| 233 | <TR> |
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| 234 | <TD vAlign="top" width="28%"> |
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| 235 | <P>v.transform_primary(F1, F2)</P> |
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| 236 | </TD> |
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| 237 | <TD vAlign="top" width="28%"> |
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| 238 | <P>X::string_type</P> |
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| 239 | </TD> |
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| 240 | <TD vAlign="top" width="45%"> |
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| 241 | <P>Returns a sort key for the character sequence designated by the iterator range |
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| 242 | [F1, F2) such that if the character sequence [G1, G2) sorts before the |
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| 243 | character sequence [H1, H2) when character case is not considered then |
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| 244 | v.transform_primary(G1, G2) < v.transform_- primary(H1, H2).</P> |
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| 245 | </TD> |
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| 246 | </TR> |
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| 247 | <TR> |
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| 248 | <TD vAlign="top" width="28%"> |
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| 249 | <P>v.lookup_classname(F1, F2)</P> |
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| 250 | </TD> |
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| 251 | <TD vAlign="top" width="28%"> |
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| 252 | <P>X::char_class_type</P> |
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| 253 | </TD> |
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| 254 | <TD vAlign="top" width="45%"> |
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| 255 | <P>Converts the character sequence designated by the iterator range [F1,F2) into a |
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| 256 | bitmask type that can subsequently be passed to isctype. Values returned from |
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| 257 | lookup_classname can be safely bitwise or'ed together. Returns 0 if the |
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| 258 | character sequence is not the name of a character class recognized by X. The |
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| 259 | value returned shall be independent of the case of the characters in the |
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| 260 | sequence.</P> |
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| 261 | </TD> |
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| 262 | </TR> |
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| 263 | <TR> |
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| 264 | <TD vAlign="top" width="28%"> |
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| 265 | <P>v.lookup_collatename(F1, F2)</P> |
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| 266 | </TD> |
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| 267 | <TD vAlign="top" width="28%"> |
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| 268 | <P>X::string_type</P> |
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| 269 | </TD> |
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| 270 | <TD vAlign="top" width="45%"> |
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| 271 | <P>Returns a sequence of characters that represents the collating element |
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| 272 | consisting of the character sequence designated by the iterator range [F1, F2). |
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| 273 | Returns an empty string if the character sequence is not a valid collating |
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| 274 | element.</P> |
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| 275 | </TD> |
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| 276 | </TR> |
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| 277 | <TR> |
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| 278 | <TD vAlign="top" width="28%"> |
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| 279 | <P>v.isctype(c, v.lookup_classname (F1, F2))</P> |
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| 280 | </TD> |
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| 281 | <TD vAlign="top" width="28%"> |
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| 282 | <P>bool</P> |
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| 283 | </TD> |
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| 284 | <TD vAlign="top" width="45%"> |
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| 285 | <P>Returns true if character c is a member of the character class designated by |
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| 286 | the iterator range [F1, F2), false otherwise.</P> |
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| 287 | </TD> |
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| 288 | </TR> |
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| 289 | <TR> |
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| 290 | <TD vAlign="top" width="28%"> |
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| 291 | <P>v.value(c, i)</P> |
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| 292 | </TD> |
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| 293 | <TD vAlign="top" width="28%"> |
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| 294 | <P>int</P> |
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| 295 | </TD> |
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| 296 | <TD vAlign="top" width="45%"> |
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| 297 | <P>Returns the value represented by the digit c in base I if the character c is a |
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| 298 | valid digit in base I; otherwise returns -1. [Note: the value of I will only be |
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| 299 | 8, 10, or 16. -end note]</P> |
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| 300 | </TD> |
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| 301 | </TR> |
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| 302 | <TR> |
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| 303 | <TD vAlign="top" width="28%"> |
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| 304 | <P>u.imbue(loc)</P> |
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| 305 | </TD> |
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| 306 | <TD vAlign="top" width="28%"> |
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| 307 | <P>X::locale_type</P> |
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| 308 | </TD> |
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| 309 | <TD vAlign="top" width="45%"> |
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| 310 | <P>Imbues <CODE>u</CODE> with the locale <CODE>loc</CODE>, returns the previous |
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| 311 | locale used by u if any. </P> |
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| 312 | </TD> |
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| 313 | </TR> |
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| 314 | <TR> |
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| 315 | <TD vAlign="top" width="28%"> |
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| 316 | <P>v.getloc()</P> |
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| 317 | </TD> |
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| 318 | <TD vAlign="top" width="28%"> |
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| 319 | <P>X::locale_type</P> |
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| 320 | </TD> |
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| 321 | <TD vAlign="top" width="45%"> |
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| 322 | <P>Returns the current locale used by <CODE>v</CODE> if any. </P> |
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| 323 | </TD> |
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| 324 | </TR> |
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| 325 | <TR> |
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| 326 | <TD vAlign="top" width="28%"> |
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| 327 | <P>v.error_string(i)</P> |
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| 328 | </TD> |
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| 329 | <TD vAlign="top" width="28%"> |
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| 330 | <P>std::string</P> |
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| 331 | </TD> |
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| 332 | <TD vAlign="top" width="45%"> |
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| 333 | <P>Returns a human readable error string for the error condition <CODE>i</CODE>, |
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| 334 | where <CODE>i</CODE> is one of the values enumerated by type <CODE>regex_constants::error_type</CODE>. |
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| 335 | If the value <CODE>i</CODE> is not recognized then returns the string "Unknown |
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| 336 | error" or a localized equivalent.</P> |
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| 337 | </TD> |
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| 338 | </TR> |
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| 339 | </TABLE> |
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| 340 | </P> |
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| 341 | <H4>Additional Optional Requirements</H4> |
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| 342 | <P>The following additional requirements are strictly optional, however in order |
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| 343 | for basic_regex to take advantage of these additional interfaces, all of the |
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| 344 | following requirements must be met; basic_regex will detect the presence or |
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| 345 | absense of member <EM>boost_extensions_tag </EM>and configure itself |
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| 346 | appropriately.</P> |
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| 347 | <P> |
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| 348 | <TABLE id="Table4" cellSpacing="1" cellPadding="1" width="100%" border="1"> |
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| 349 | <TR> |
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| 350 | <TD><STRONG>Expression</STRONG></TD> |
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| 351 | <TD width="231"><STRONG>Result</STRONG></TD> |
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| 352 | <TD> |
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| 353 | <P><STRONG>Assertion / Note |
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| 354 | <BR> |
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| 355 | Pre / Post condition</STRONG></P> |
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| 356 | </TD> |
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| 357 | </TR> |
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| 358 | <TR> |
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| 359 | <TD>X::boost_extensions_tag</TD> |
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| 360 | <TD width="231">An unspecified type.</TD> |
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| 361 | <TD>When present, all of the extensions listed in this table must be present.</TD> |
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| 362 | </TR> |
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| 363 | <TR> |
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| 364 | <TD> |
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| 365 | <P>v.syntax_type(c)</P> |
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| 366 | </TD> |
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| 367 | <TD width="231"><A href="../../../boost/regex/v4/syntax_type.hpp">regex_constants::syntax_type</A></TD> |
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| 368 | <TD> |
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| 369 | <P>Returns a symbolic value of type <CODE>regex_constants::syntax_type </CODE>that |
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| 370 | signifies the meaning of character <CODE>c</CODE> within the regular expression |
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| 371 | grammar.</P> |
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| 372 | </TD> |
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| 373 | </TR> |
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| 374 | <TR> |
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| 375 | <TD>v.escape_syntax_type(c)</TD> |
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| 376 | <TD width="231"><A href="../../../boost/regex/v4/syntax_type.hpp">regex_constants::escape_syntax_type</A></TD> |
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| 377 | <TD> |
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| 378 | <P>Returns a symbolic value of type <CODE>regex_constants::escape_syntax_type</CODE>, |
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| 379 | that signifies the meaning of character <CODE>c</CODE> within the regular |
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| 380 | expression grammar, when <CODE>c</CODE> has been preceded by an escape |
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| 381 | character. Precondition: if <CODE>b</CODE> is the character preceding <CODE>c</CODE> |
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| 382 | in the expression being parsed then: <CODE>v.syntax_type(b) == syntax_escape</CODE></P> |
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| 383 | </TD> |
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| 384 | </TR> |
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| 385 | <TR> |
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| 386 | <TD> |
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| 387 | <P>v.translate(c, b)</P> |
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| 388 | </TD> |
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| 389 | <TD width="231">X::char_type</TD> |
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| 390 | <TD> |
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| 391 | <P>Returns a character <CODE>d</CODE> such that: for any character <CODE>d</CODE> that |
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| 392 | is to be considered equivalent to <CODE>c</CODE> then <CODE>v.translate(c,false)==v.translate(d,false)</CODE>. |
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| 393 | Likewise for all characters <CODE>C</CODE> that are to be considered equivalent |
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| 394 | to <CODE>c</CODE> when comparisons are to be performed without regard to case, |
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| 395 | then <CODE>v.translate(c,true)==v.translate(C,true)</CODE>.</P> |
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| 396 | </TD> |
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| 397 | </TR> |
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| 398 | <TR> |
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| 399 | <TD> |
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| 400 | <P>v.toi(I1, I2, i)</P> |
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| 401 | </TD> |
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| 402 | <TD width="231">An integer type capable of holding either a charT or an int.</TD> |
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| 403 | <TD> |
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| 404 | <P>Behaves as follows: if <CODE>p==q</CODE> or if <CODE>*p </CODE>is not a digit |
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| 405 | character then returns -1. Otherwise performs formatted numeric input on the |
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| 406 | sequence [p,q) and returns the result as an int. Postcondition: either <CODE>p == |
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| 407 | q</CODE> or <CODE>*p</CODE> is a non-digit character.</P> |
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| 408 | </TD> |
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| 409 | </TR> |
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| 410 | <TR> |
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| 411 | <TD> |
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| 412 | <P>v.error_string(i)</P> |
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| 413 | </TD> |
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| 414 | <TD width="231">std::string</TD> |
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| 415 | <TD> |
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| 416 | <P>Returns a human readable error string for the error condition <CODE>i</CODE>, |
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| 417 | where <CODE>i</CODE> is one of the values enumerated by type <CODE><A href="error_type.html"> |
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| 418 | regex_constants::error_type</A></CODE>. If the value <CODE>i</CODE> |
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| 419 | is not recognized then returns the string "Unknown error" or a localized |
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| 420 | equivalent.</P> |
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| 421 | </TD> |
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| 422 | </TR> |
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| 423 | <TR> |
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| 424 | <TD>v.tolower(c)</TD> |
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| 425 | <TD width="231">X::char_type</TD> |
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| 426 | <TD>Converts c to lower case, used for Perl-style \l and \L formating operations.</TD> |
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| 427 | </TR> |
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| 428 | <TR> |
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| 429 | <TD>v.toupper(c)</TD> |
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| 430 | <TD width="231">X::char_type</TD> |
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| 431 | <TD>Converts c to upper case, used for Perl-style \u and \U formating operations.</TD> |
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| 432 | </TR> |
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| 433 | </TABLE> |
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| 434 | </P> |
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| 435 | <H3><A name="iterator"></A>Iterator Rrequirements</H3> |
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| 436 | <P> |
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| 437 | <P>The regular expression algorithms (and iterators) take all require a |
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| 438 | Bidirectional-Iterator.</P> |
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| 439 | <P> |
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| 440 | <HR> |
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| 441 | </P> |
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| 442 | <P></P> |
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| 443 | <p>Revised |
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| 444 | <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan --> |
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| 445 | 24 June 2004 |
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| 446 | <!--webbot bot="Timestamp" endspan i-checksum="39359" --></p> |
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| 447 | <p><i>© Copyright John Maddock 1998- |
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| 448 | <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan --> 2004<!--webbot bot="Timestamp" endspan i-checksum="39359" --></i></p> |
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| 449 | <P><I>Use, modification and distribution are subject to the Boost Software License, |
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| 450 | Version 1.0. (See accompanying file <A href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</A> |
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| 451 | or copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>)</I></P> |
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| 452 | </body> |
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| 453 | </html> |
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