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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /gcc/testsuite/g++.dg/template/sfinae4.C | |
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Diffstat (limited to 'gcc/testsuite/g++.dg/template/sfinae4.C')
-rw-r--r-- | gcc/testsuite/g++.dg/template/sfinae4.C | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/template/sfinae4.C b/gcc/testsuite/g++.dg/template/sfinae4.C new file mode 100644 index 000000000..a9650511e --- /dev/null +++ b/gcc/testsuite/g++.dg/template/sfinae4.C @@ -0,0 +1,35 @@ +// DR 339 +// +// Test of the use of free functions with SFINAE +void foo(int) { } +template<typename T> void foo(T*) { } + +typedef char yes_type; +struct no_type { char data[2]; }; + +template<typename T> T create_a(); + +template<bool, typename T = void> struct enable_if { typedef T type; }; +template<typename T> struct enable_if<false, T> { }; + +template<typename T> + typename enable_if<(sizeof(foo(create_a<T const&>()), 1) > 0), + yes_type>::type + check_has_foo(const volatile T&); + +no_type check_has_foo(...); + +template<typename T> +struct has_foo +{ + static const bool value = + (sizeof(check_has_foo(create_a<T const&>())) == sizeof(yes_type)); +}; + +struct X { }; + +int a1[has_foo<int>::value? 1 : -1]; +int a2[has_foo<long>::value? 1 : -1]; +int a3[has_foo<int*>::value? 1 : -1]; +int a4[has_foo<X>::value? -1 : 1]; +int a5[has_foo<int X::*>::value? -1 : 1]; |