// DR 339
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// DR 339
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//
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//
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// Test of the use of free functions with SFINAE
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// Test of the use of free functions with SFINAE
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void foo(int) { }
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void foo(int) { }
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template void foo(T*) { }
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template void foo(T*) { }
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typedef char yes_type;
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typedef char yes_type;
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struct no_type { char data[2]; };
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struct no_type { char data[2]; };
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template T create_a();
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template T create_a();
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template struct enable_if { typedef T type; };
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template struct enable_if { typedef T type; };
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template struct enable_if { };
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template struct enable_if { };
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template
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template
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typename enable_if<(sizeof(foo(create_a()), 1) > 0),
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typename enable_if<(sizeof(foo(create_a()), 1) > 0),
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yes_type>::type
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yes_type>::type
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check_has_foo(const volatile T&);
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check_has_foo(const volatile T&);
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no_type check_has_foo(...);
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no_type check_has_foo(...);
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template
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template
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struct has_foo
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struct has_foo
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{
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{
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static const bool value =
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static const bool value =
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(sizeof(check_has_foo(create_a())) == sizeof(yes_type));
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(sizeof(check_has_foo(create_a())) == sizeof(yes_type));
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};
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};
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struct X { };
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struct X { };
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int a1[has_foo::value? 1 : -1];
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int a1[has_foo::value? 1 : -1];
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int a2[has_foo::value? 1 : -1];
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int a2[has_foo::value? 1 : -1];
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int a3[has_foo::value? 1 : -1];
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int a3[has_foo::value? 1 : -1];
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int a4[has_foo::value? -1 : 1];
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int a4[has_foo::value? -1 : 1];
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int a5[has_foo::value? -1 : 1];
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int a5[has_foo::value? -1 : 1];
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