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type_traits (__is_function_helper): New, uses variadic templates.

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2007-04-10  Paolo Carlini  <pcarlini@suse.de>

	* include/tr1/type_traits (__is_function_helper): New, uses
	variadic templates.
	(is_function): Forward to the latter.
	* testsuite/tr1/4_metaprogramming/primary_type_categories/
	is_function/is_function.cc: Add test.

From-SVN: r123695
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Paolo Carlini 2007-04-10 15:12:54 +00:00 committed by Paolo Carlini
parent 0218c0120c
commit 05beb8e720
3 changed files with 26 additions and 7 deletions
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8
libstdc++-v3/ChangeLog
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@ -1,3 +1,11 @@
2007-04-10 Paolo Carlini <pcarlini@suse.de>
* include/tr1/type_traits (__is_function_helper): New, uses
variadic templates.
(is_function): Forward to the latter.
* testsuite/tr1/4_metaprogramming/primary_type_categories/
is_function/is_function.cc: Add test.
2007-04-10 Paolo Carlini <pcarlini@suse.de>
PR libstdc++/28277 (partial: vstring bits)

22
libstdc++-v3/include/tr1/type_traits
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@ -34,6 +34,8 @@
#ifndef _TR1_TYPE_TRAITS
#define _TR1_TYPE_TRAITS 1
#pragma GCC system_header
#include <bits/c++config.h>
#include <tr1/type_traits_fwd.h>
@ -171,14 +173,22 @@ _GLIBCXX_BEGIN_NAMESPACE(_GLIBCXX_TR1)
: public integral_constant<bool, __is_class(_Tp)>
{ };
template<typename>
struct __is_function_helper
: public false_type { };
template<typename _Res, typename... _ArgTypes>
struct __is_function_helper<_Res(_ArgTypes...)>
: public true_type { };
template<typename _Res, typename... _ArgTypes>
struct __is_function_helper<_Res(_ArgTypes......)>
: public true_type { };
template<typename _Tp>
struct is_function
: public integral_constant<bool, !(is_void<_Tp>::value
|| is_scalar<_Tp>::value
|| is_array<_Tp>::value
|| is_reference<_Tp>::value
|| is_union<_Tp>::value
|| is_class<_Tp>::value)>
: public integral_constant<bool, (__is_function_helper<typename
remove_cv<_Tp>::type>::value)>
{ };
/// @brief composite type traits [4.5.2].

3
libstdc++-v3/testsuite/tr1/4_metaprogramming/primary_type_categories/is_function/is_function.cc
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@ -1,6 +1,6 @@
// 2004-12-16 Paolo Carlini <pcarlini@suse.de>
//
// Copyright (C) 2004, 2005 Free Software Foundation, Inc.
// Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
@ -34,6 +34,7 @@ void test01()
VERIFY( (test_category<is_function, int (int)>(true)) );
VERIFY( (test_category<is_function, ClassType (ClassType)>(true)) );
VERIFY( (test_category<is_function, float (int, float, int[], int&)>(true)) );
VERIFY( (test_category<is_function, int (int, ...)>(true)) );
// Negative tests.
VERIFY( (test_category<is_function, int&>(false)) );