1 | // Boost ios_state_test.cpp test file --------------------------------------// |
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2 | |
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3 | // Copyright 2002, 2003 Daryle Walker. Use, modification, and distribution are |
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4 | // subject to the Boost Software License, Version 1.0. (See accompanying file |
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5 | // LICENSE_1_0.txt or a copy at <http://www.boost.org/LICENSE_1_0.txt>.) |
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6 | |
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7 | // See <http://www.boost.org/libs/io/> for the library's home page. |
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8 | |
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9 | // Revision History |
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10 | // 15 Jun 2003 Adjust to changes in Boost.Test (Daryle Walker) |
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11 | // 26 Feb 2002 Initial version (Daryle Walker) |
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12 | |
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13 | #include <boost/test/minimal.hpp> // main, BOOST_CHECK, etc. |
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14 | |
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15 | #include <boost/cstdlib.hpp> // for boost::exit_success |
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16 | #include <boost/io/ios_state.hpp> // for boost::io::ios_flags_saver, etc. |
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17 | |
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18 | #include <cstddef> // for std::size_t |
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19 | #include <iomanip> // for std::setw |
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20 | #include <ios> // for std::ios_base, std::streamsize, etc. |
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21 | #include <iostream> // for std::cout, etc. |
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22 | #include <istream> // for std::istream |
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23 | #include <locale> // for std::numpunct, std::locale |
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24 | #include <ostream> // for std::endl, std::ostream |
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25 | #include <streambuf> // for std::streambuf |
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26 | #include <string> // for std::string |
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27 | |
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28 | |
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29 | // Facet with the bool names spelled backwards |
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30 | class backward_bool_names |
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31 | : public std::numpunct<char> |
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32 | { |
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33 | typedef std::numpunct<char> base_type; |
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34 | |
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35 | public: |
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36 | explicit backward_bool_names( std::size_t refs = 0 ) |
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37 | : base_type( refs ) |
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38 | {} |
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39 | |
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40 | protected: |
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41 | virtual ~backward_bool_names() {} |
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42 | |
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43 | virtual base_type::string_type do_truename() const |
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44 | { return "eurt"; } |
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45 | virtual base_type::string_type do_falsename() const |
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46 | { return "eslaf"; } |
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47 | }; |
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48 | |
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49 | |
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50 | // Index to test custom storage |
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51 | int const my_index = std::ios_base::xalloc(); |
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52 | |
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53 | // Test data |
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54 | char const test_string[] = "Hello world"; |
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55 | int const test_num1 = -16; |
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56 | double const test_num2 = 34.5678901234; |
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57 | bool const test_bool = true; |
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58 | |
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59 | |
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60 | // Function prototypes |
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61 | void saver_tests_1( std::istream &input, std::ostream &output, |
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62 | std::ostream &err ); |
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63 | void saver_tests_2( std::istream &input, std::ostream &output, |
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64 | std::ostream &err ); |
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65 | |
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66 | |
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67 | // Test program |
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68 | int |
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69 | test_main |
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70 | ( |
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71 | int , // "argc" is unused |
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72 | char * [] // "argv" is unused |
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73 | ) |
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74 | { |
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75 | using std::cout; |
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76 | using std::ios_base; |
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77 | using std::streamsize; |
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78 | using std::cin; |
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79 | |
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80 | cout << "The original data is:\n"; |
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81 | cout << '\t' << test_string << '\n'; |
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82 | cout << '\t' << test_num1 << '\n'; |
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83 | cout << '\t' << test_num2 << '\n'; |
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84 | cout << '\t' << std::boolalpha << test_bool << std::endl; |
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85 | |
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86 | // Save states for comparison later |
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87 | ios_base::fmtflags const cout_flags = cout.flags(); |
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88 | streamsize const cout_precision = cout.precision(); |
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89 | streamsize const cout_width = cout.width(); |
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90 | ios_base::iostate const cout_iostate = cout.rdstate(); |
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91 | ios_base::iostate const cout_exceptions = cout.exceptions(); |
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92 | std::ostream * const cin_tie = cin.tie(); |
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93 | std::streambuf * const cout_sb = cout.rdbuf(); |
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94 | char const cout_fill = cout.fill(); |
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95 | std::locale const cout_locale = cout.getloc(); |
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96 | |
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97 | cout.iword( my_index ) = 42L; |
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98 | cout.pword( my_index ) = &cin; |
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99 | |
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100 | // Run saver tests with changing separate from saving |
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101 | saver_tests_1( cin, cout, std::cerr ); |
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102 | |
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103 | // Check if states are back to normal |
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104 | BOOST_CHECK( &cin == cout.pword(my_index) ); |
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105 | BOOST_CHECK( 42L == cout.iword(my_index) ); |
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106 | BOOST_CHECK( cout_locale == cout.getloc() ); |
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107 | BOOST_CHECK( cout_fill == cout.fill() ); |
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108 | BOOST_CHECK( cout_sb == cout.rdbuf() ); |
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109 | BOOST_CHECK( cin_tie == cin.tie() ); |
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110 | BOOST_CHECK( cout_exceptions == cout.exceptions() ); |
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111 | BOOST_CHECK( cout_iostate == cout.rdstate() ); |
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112 | BOOST_CHECK( cout_width == cout.width() ); |
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113 | BOOST_CHECK( cout_precision == cout.precision() ); |
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114 | BOOST_CHECK( cout_flags == cout.flags() ); |
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115 | |
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116 | // Run saver tests with combined saving and changing |
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117 | saver_tests_2( cin, cout, std::cerr ); |
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118 | |
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119 | // Check if states are back to normal |
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120 | BOOST_CHECK( &cin == cout.pword(my_index) ); |
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121 | BOOST_CHECK( 42L == cout.iword(my_index) ); |
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122 | BOOST_CHECK( cout_locale == cout.getloc() ); |
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123 | BOOST_CHECK( cout_fill == cout.fill() ); |
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124 | BOOST_CHECK( cout_sb == cout.rdbuf() ); |
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125 | BOOST_CHECK( cin_tie == cin.tie() ); |
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126 | BOOST_CHECK( cout_exceptions == cout.exceptions() ); |
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127 | BOOST_CHECK( cout_iostate == cout.rdstate() ); |
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128 | BOOST_CHECK( cout_width == cout.width() ); |
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129 | BOOST_CHECK( cout_precision == cout.precision() ); |
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130 | BOOST_CHECK( cout_flags == cout.flags() ); |
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131 | |
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132 | return boost::exit_success; |
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133 | } |
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134 | |
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135 | // Save, change, and restore stream properties |
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136 | void |
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137 | saver_tests_1 |
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138 | ( |
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139 | std::istream & input, |
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140 | std::ostream & output, |
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141 | std::ostream & err |
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142 | ) |
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143 | { |
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144 | using std::locale; |
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145 | using std::ios_base; |
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146 | using std::setw; |
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147 | |
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148 | boost::io::ios_flags_saver const ifls( output ); |
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149 | boost::io::ios_precision_saver const iprs( output ); |
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150 | boost::io::ios_width_saver const iws( output ); |
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151 | boost::io::ios_tie_saver const its( input ); |
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152 | boost::io::ios_rdbuf_saver const irs( output ); |
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153 | boost::io::ios_fill_saver const ifis( output ); |
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154 | boost::io::ios_locale_saver const ils( output ); |
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155 | boost::io::ios_iword_saver const iis( output, my_index ); |
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156 | boost::io::ios_pword_saver const ipws( output, my_index ); |
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157 | |
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158 | locale loc( locale::classic(), new backward_bool_names ); |
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159 | |
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160 | input.tie( &err ); |
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161 | output.rdbuf( err.rdbuf() ); |
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162 | output.iword( my_index ) = 69L; |
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163 | output.pword( my_index ) = &err; |
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164 | |
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165 | output << "The data is (again):\n"; |
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166 | output.setf( ios_base::showpos | ios_base::boolalpha ); |
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167 | output.setf( ios_base::internal, ios_base::adjustfield ); |
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168 | output.fill( '@' ); |
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169 | output.precision( 9 ); |
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170 | output << '\t' << test_string << '\n'; |
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171 | output << '\t' << setw( 10 ) << test_num1 << '\n'; |
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172 | output << '\t' << setw( 15 ) << test_num2 << '\n'; |
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173 | output.imbue( loc ); |
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174 | output << '\t' << test_bool << '\n'; |
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175 | |
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176 | BOOST_CHECK( &err == output.pword(my_index) ); |
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177 | BOOST_CHECK( 69L == output.iword(my_index) ); |
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178 | |
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179 | try |
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180 | { |
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181 | boost::io::ios_exception_saver const ies( output ); |
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182 | boost::io::ios_iostate_saver const iis( output ); |
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183 | |
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184 | output.exceptions( ios_base::eofbit ); |
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185 | output.setstate( ios_base::eofbit ); |
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186 | BOOST_ERROR( "previous line should have thrown" ); |
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187 | } |
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188 | catch ( ios_base::failure &f ) |
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189 | { |
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190 | err << "Got the expected I/O failure: \"" << f.what() << "\".\n"; |
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191 | BOOST_CHECK( output.exceptions() == ios_base::goodbit ); |
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192 | } |
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193 | catch ( ... ) |
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194 | { |
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195 | err << "Got an unknown error when doing exception test!\n"; |
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196 | throw; |
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197 | } |
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198 | } |
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199 | |
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200 | // Save & change and restore stream properties |
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201 | void |
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202 | saver_tests_2 |
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203 | ( |
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204 | std::istream & input, |
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205 | std::ostream & output, |
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206 | std::ostream & err |
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207 | ) |
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208 | { |
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209 | using std::locale; |
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210 | using std::ios_base; |
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211 | |
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212 | boost::io::ios_tie_saver const its( input, &err ); |
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213 | boost::io::ios_rdbuf_saver const irs( output, err.rdbuf() ); |
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214 | boost::io::ios_iword_saver const iis( output, my_index, 69L ); |
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215 | boost::io::ios_pword_saver const ipws( output, my_index, &err ); |
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216 | output << "The data is (a third time; adding the numbers):\n"; |
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217 | |
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218 | boost::io::ios_flags_saver const ifls( output, (output.flags() |
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219 | & ~ios_base::adjustfield) | ios_base::showpos | ios_base::boolalpha |
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220 | | (ios_base::internal & ios_base::adjustfield) ); |
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221 | boost::io::ios_precision_saver const iprs( output, 9 ); |
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222 | boost::io::ios_fill_saver const ifis( output, '@' ); |
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223 | output << '\t' << test_string << '\n'; |
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224 | |
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225 | boost::io::ios_width_saver const iws( output, 12 ); |
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226 | output.put( '\t' ); |
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227 | output << test_num1 + test_num2; |
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228 | output.put( '\n' ); |
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229 | |
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230 | locale loc( locale::classic(), |
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231 | new backward_bool_names ); |
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232 | boost::io::ios_locale_saver const ils( output, loc ); |
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233 | output << '\t' << test_bool << '\n'; |
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234 | |
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235 | BOOST_CHECK( &err == output.pword(my_index) ); |
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236 | BOOST_CHECK( 69L == output.iword(my_index) ); |
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237 | |
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238 | try |
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239 | { |
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240 | boost::io::ios_exception_saver const ies( output, ios_base::eofbit ); |
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241 | boost::io::ios_iostate_saver const iis( output, output.rdstate() |
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242 | | ios_base::eofbit ); |
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243 | |
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244 | BOOST_ERROR( "previous line should have thrown" ); |
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245 | } |
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246 | catch ( ios_base::failure &f ) |
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247 | { |
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248 | err << "Got the expected I/O failure: \"" << f.what() << "\".\n"; |
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249 | BOOST_CHECK( output.exceptions() == ios_base::goodbit ); |
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250 | } |
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251 | catch ( ... ) |
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252 | { |
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253 | err << "Got an unknown error when doing exception test!\n"; |
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254 | throw; |
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255 | } |
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256 | } |
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