feedc0de/boost_fusion
1
0
Fork 0
forked from boostorg/fusion
Code Pull Requests Activity

fusion fold and transform passing refs for lvalues as per result_of protocol

Browse Source 
[SVN r38039]
This commit is contained in:
Dan Marsden
2007-06-19 21:30:06 +00:00
parent 0e5cb04b99
commit 09a6da1f80
13 changed files with 157 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
test/algorithm/transform.cpp
View File

@ -19,13 +19,12 @@
struct square
{
template<typename T>
template<typename Sig>
struct result;
template <typename T>
struct result<square(T)>
{
BOOST_STATIC_ASSERT(!boost::is_reference<T>::value);
typedef int type;
};
@ -38,7 +37,7 @@ struct square
struct add
{
template<typename T>
template<typename Sig>
struct result;
template <typename A, typename B>
@ -54,6 +53,42 @@ struct add
}
};
struct unary_lvalue_transform
{
template<typename Sig>
struct result;
template<typename T>
struct result<unary_lvalue_transform(T&)>
{
typedef T* type;
};
template<typename T>
T* operator()(T& t) const
{
return &t;
}
};
struct binary_lvalue_transform
{
template<typename Sig>
struct result;
template<typename T0, typename T1>
struct result<binary_lvalue_transform(T0&,T1&)>
{
typedef T0* type;
};
template<typename T0, typename T1>
T0* operator()(T0& t0, T1&) const
{
return &t0;
}
};
int
main()
{
@ -92,6 +127,20 @@ main()
BOOST_TEST((transform(tup1, tup2, add()) == make_vector(5, 7, 9)));
}
{
// Unary transform that requires lvalues, just check compilation
vector<int, int, int> tup1(1, 2, 3);
BOOST_TEST(at_c<0>(transform(tup1, unary_lvalue_transform())) == &at_c<0>(tup1));
BOOST_TEST(*begin(transform(tup1, unary_lvalue_transform())) == &at_c<0>(tup1));
}
{
vector<int, int, int> tup1(1, 2, 3);
vector<int, int, int> tup2(4, 5, 6);
BOOST_TEST(at_c<0>(transform(tup1, tup2, binary_lvalue_transform())) == &at_c<0>(tup1));
BOOST_TEST(*begin(transform(tup1, tup2, binary_lvalue_transform())) == &at_c<0>(tup1));
}
return boost::report_errors();
}