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1 | // (C) Copyright Gennadiy Rozental 2001. |
2 | // Distributed under the Boost Software License, Version 1.0. | |
3 | // (See accompanying file LICENSE_1_0.txt or copy at | |
4 | // http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | // See http://www.boost.org/libs/test for the library home page. | |
7 | // | |
8 | // Description : contains definition for all test tools in test toolbox | |
9 | // *************************************************************************** | |
10 | ||
11 | #ifndef BOOST_TEST_UTILS_LAZY_OSTREAM_HPP | |
12 | #define BOOST_TEST_UTILS_LAZY_OSTREAM_HPP | |
13 | ||
14 | // Boost.Test | |
15 | #include <boost/test/detail/config.hpp> | |
16 | ||
17 | // STL | |
18 | #include <iosfwd> | |
19 | ||
20 | #include <boost/test/detail/suppress_warnings.hpp> | |
21 | ||
22 | //____________________________________________________________________________// | |
23 | ||
24 | // ************************************************************************** // | |
25 | // ************** lazy_ostream ************** // | |
26 | // ************************************************************************** // | |
27 | ||
28 | namespace boost { | |
29 | namespace unit_test { | |
30 | ||
31 | class lazy_ostream { | |
32 | public: | |
33 | virtual ~lazy_ostream() {} | |
34 | ||
35 | static lazy_ostream& instance() { static lazy_ostream inst; return inst; } | |
36 | ||
37 | friend std::ostream& operator<<( std::ostream& ostr, lazy_ostream const& o ) { return o( ostr ); } | |
38 | ||
39 | // access method | |
40 | bool empty() const { return m_empty; } | |
41 | ||
42 | // actual printing interface; to be accessed only by this class and children | |
43 | virtual std::ostream& operator()( std::ostream& ostr ) const { return ostr; } | |
44 | protected: | |
45 | explicit lazy_ostream( bool p_empty = true ) : m_empty( p_empty ) {} | |
46 | ||
47 | private: | |
48 | // Data members | |
49 | bool m_empty; | |
50 | }; | |
51 | ||
52 | //____________________________________________________________________________// | |
53 | ||
54 | template<typename PrevType, typename T, typename StorageT=T const&> | |
55 | class lazy_ostream_impl : public lazy_ostream { | |
56 | public: | |
57 | lazy_ostream_impl( PrevType const& prev, T const& value ) | |
58 | : lazy_ostream( false ) | |
59 | , m_prev( prev ) | |
60 | , m_value( value ) | |
61 | { | |
62 | } | |
63 | ||
64 | virtual std::ostream& operator()( std::ostream& ostr ) const | |
65 | { | |
66 | return m_prev(ostr) << m_value; | |
67 | } | |
68 | private: | |
69 | // Data members | |
70 | PrevType const& m_prev; | |
71 | StorageT m_value; | |
72 | }; | |
73 | ||
74 | //____________________________________________________________________________// | |
75 | ||
76 | template<typename T> | |
77 | inline lazy_ostream_impl<lazy_ostream,T> | |
78 | operator<<( lazy_ostream const& prev, T const& v ) | |
79 | { | |
80 | return lazy_ostream_impl<lazy_ostream,T>( prev, v ); | |
81 | } | |
82 | ||
83 | //____________________________________________________________________________// | |
84 | ||
85 | template<typename PrevPrevType, typename TPrev, typename T> | |
86 | inline lazy_ostream_impl<lazy_ostream_impl<PrevPrevType,TPrev>,T> | |
87 | operator<<( lazy_ostream_impl<PrevPrevType,TPrev> const& prev, T const& v ) | |
88 | { | |
89 | typedef lazy_ostream_impl<PrevPrevType,TPrev> PrevType; | |
90 | return lazy_ostream_impl<PrevType,T>( prev, v ); | |
91 | } | |
92 | ||
93 | //____________________________________________________________________________// | |
94 | ||
95 | #if BOOST_TEST_USE_STD_LOCALE | |
96 | ||
97 | template<typename R,typename S> | |
98 | inline lazy_ostream_impl<lazy_ostream,R& (BOOST_TEST_CALL_DECL *)(S&),R& (BOOST_TEST_CALL_DECL *)(S&)> | |
99 | operator<<( lazy_ostream const& prev, R& (BOOST_TEST_CALL_DECL *man)(S&) ) | |
100 | { | |
101 | typedef R& (BOOST_TEST_CALL_DECL * ManipType)(S&); | |
102 | ||
103 | return lazy_ostream_impl<lazy_ostream,ManipType,ManipType>( prev, man ); | |
104 | } | |
105 | ||
106 | //____________________________________________________________________________// | |
107 | ||
108 | template<typename PrevPrevType, typename TPrev,typename R,typename S> | |
109 | inline lazy_ostream_impl<lazy_ostream_impl<PrevPrevType,TPrev>,R& (BOOST_TEST_CALL_DECL *)(S&),R& (BOOST_TEST_CALL_DECL *)(S&)> | |
110 | operator<<( lazy_ostream_impl<PrevPrevType,TPrev> const& prev, R& (BOOST_TEST_CALL_DECL *man)(S&) ) | |
111 | { | |
112 | typedef R& (BOOST_TEST_CALL_DECL * ManipType)(S&); | |
113 | ||
114 | return lazy_ostream_impl<lazy_ostream_impl<PrevPrevType,TPrev>,ManipType,ManipType>( prev, man ); | |
115 | } | |
116 | ||
117 | //____________________________________________________________________________// | |
118 | ||
119 | #endif | |
120 | ||
121 | #define BOOST_TEST_LAZY_MSG( M ) (::boost::unit_test::lazy_ostream::instance() << M) | |
122 | ||
123 | } // namespace unit_test | |
124 | } // namespace boost | |
125 | ||
126 | #include <boost/test/detail/enable_warnings.hpp> | |
127 | ||
128 | #endif // BOOST_TEST_UTILS_LAZY_OSTREAM_HPP |