1 | // Copyright David Abrahams, Daniel Wallin 2003. Use, modification and |
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2 | // distribution is subject to the Boost Software License, Version 1.0. |
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3 | // (See accompanying file LICENSE_1_0.txt or copy at |
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4 | // http://www.boost.org/LICENSE_1_0.txt |
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5 | |
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6 | #include <boost/parameter.hpp> |
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7 | #include <cassert> |
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8 | #include <string> |
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9 | #include <boost/type_traits/is_convertible.hpp> |
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10 | #include <iostream> |
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11 | |
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12 | #ifndef BOOST_NO_SFINAE |
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13 | # include <boost/utility/enable_if.hpp> |
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14 | # include <boost/type_traits/is_same.hpp> |
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15 | #endif |
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16 | |
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17 | namespace test |
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18 | { |
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19 | BOOST_PARAMETER_KEYWORD(keywords,name) |
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20 | BOOST_PARAMETER_KEYWORD(keywords,value) |
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21 | |
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22 | using namespace boost::parameter; |
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23 | |
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24 | struct f_parameters |
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25 | : parameters< |
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26 | optional< |
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27 | keywords::name |
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28 | , boost::is_convertible<boost::mpl::_, std::string> |
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29 | > |
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30 | , optional< |
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31 | keywords::value |
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32 | , boost::is_convertible<boost::mpl::_, float> |
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33 | > |
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34 | > |
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35 | {}; |
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36 | |
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37 | template <class T> struct not_implemented; |
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38 | |
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39 | template<class P> |
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40 | void f_impl(P const& p) |
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41 | { |
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42 | std::string s = p[name | "bar"]; |
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43 | float v = p[value | 3.f]; |
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44 | |
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45 | assert(s == "foo"); |
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46 | assert(v == 3.f); |
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47 | } |
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48 | |
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49 | void f() |
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50 | { |
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51 | f_impl(f_parameters()()); |
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52 | } |
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53 | |
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54 | using boost::parameter::aux::void_; |
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55 | |
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56 | template<class A0> |
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57 | void f( |
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58 | A0 const& a0 |
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59 | , BOOST_PARAMETER_MATCH(f_parameters, (A0), args)) |
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60 | { |
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61 | f_impl(args(a0)); |
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62 | } |
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63 | |
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64 | template<class A0, class A1> |
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65 | void f( |
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66 | A0 const& a0, A1 const& a1 |
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67 | , BOOST_PARAMETER_MATCH(f_parameters,(A0)(A1), args)) |
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68 | { |
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69 | f_impl(args(a0, a1)); |
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70 | } |
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71 | |
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72 | #ifndef BOOST_NO_SFINAE |
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73 | // On compilers that actually support SFINAE, add another overload |
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74 | // that is an equally good match and can only be in the overload set |
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75 | // when the others are not. This tests that the SFINAE is actually |
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76 | // working. On all other compilers we're just checking that |
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77 | // everything about SFINAE-enabled code will work, except of course |
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78 | // the SFINAE. |
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79 | template<class A0, class A1> |
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80 | typename boost::enable_if<boost::is_same<int,A0>, int>::type |
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81 | f(A0 const& a0, A1 const& a1) |
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82 | { |
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83 | return 0; |
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84 | } |
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85 | #endif |
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86 | } // namespace test |
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87 | |
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88 | int main() |
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89 | { |
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90 | using test::name; |
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91 | using test::value; |
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92 | using test::f; |
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93 | |
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94 | f("foo"); |
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95 | f("foo", 3.f); |
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96 | f(value = 3.f, name = "foo"); |
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97 | |
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98 | #ifndef BOOST_NO_SFINAE |
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99 | return f(3, 4); |
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100 | #else |
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101 | return 0; |
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102 | #endif |
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103 | } |
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104 | |
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