boost_proto 0.1.0

Boost C++ library boost_proto packaged using Zanbil
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131

///////////////////////////////////////////////////////////////////////////////
// constrained_ops.cpp
//
//  Copyright 2010 Thomas Heller
//  Copyright 2011 Eric Niebler
//
//  Distributed under the Boost Software License, Version 1.0. (See accompanying
//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#include <boost/proto/proto.hpp>
#include <boost/test/unit_test.hpp>

using namespace boost;

typedef proto::terminal<int>::type term;

struct equation;

struct addition:
    proto::or_
    <
       proto::terminal<proto::_>,
       proto::plus<addition, addition>
    >
{};

struct equation:
    proto::or_
    <
        proto::equal_to<addition, addition>
    >
{};

template<class Expr>
struct extension;

struct my_domain:
    proto::domain
    <
         proto::pod_generator<extension>,
         equation,
         proto::default_domain
    >
{};

template<class Expr>
struct lhs_extension;

struct my_lhs_domain:
    proto::domain
    <
        proto::pod_generator<lhs_extension>,
        addition,
        my_domain
    >
{};

template<class Expr>
struct rhs_extension;

struct my_rhs_domain:
    proto::domain
    <
        proto::pod_generator<rhs_extension>,
        addition,
        my_domain
    >
{};

template<class Expr>
struct extension
{
     BOOST_PROTO_BASIC_EXTENDS(
         Expr
       , extension<Expr>
       , my_domain
     )

    void test() const
    {}
};

template<class Expr>
struct lhs_extension
{
     BOOST_PROTO_BASIC_EXTENDS(
         Expr
       , lhs_extension<Expr>
       , my_lhs_domain
     )
};

template<class Expr>
struct rhs_extension
{
     BOOST_PROTO_BASIC_EXTENDS(
         Expr
       , rhs_extension<Expr>
       , my_rhs_domain
     )
};

void test_constrained_ops()
{
     lhs_extension<term> const i = {};
     rhs_extension<term> const j = {};

     proto::assert_matches_not<equation>(i);              // false
     proto::assert_matches_not<equation>(j);              // false
     proto::assert_matches_not<equation>(i + i);          // false
     proto::assert_matches_not<equation>(j + j);          // false
#if 0
     proto::assert_matches_not<equation>(i + j);          // compile error (by design)
     proto::assert_matches_not<equation>(j + i);          // compile error (by design)
#endif
     proto::assert_matches<equation>(i == j);             // true
     proto::assert_matches<equation>(i == j + j);         // true
     proto::assert_matches<equation>(i + i == j);         // true
     proto::assert_matches<equation>(i + i == j + j);     // true
}

using namespace boost::unit_test;
///////////////////////////////////////////////////////////////////////////////
// init_unit_test_suite
//
test_suite* init_unit_test_suite( int argc, char* argv[] )
{
    test_suite *test = BOOST_TEST_SUITE("test constrained EDSLs");
    test->add(BOOST_TEST_CASE(&test_constrained_ops));
    return test;
}