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type_traits.h (__numeric_traits_integer): New.

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2006-09-21  Benjamin Kosnik  <bkoz@redhat.com>

	* include/ext/type_traits.h (__numeric_traits_integer): New.
	(__numeric_traits_floating): New.
	(__numeric_traits): Use them.
	* testsuite/ext/type_traits.cc: New.

From-SVN: r117119
This commit is contained in:
Benjamin Kosnik 2006-09-21 20:07:10 +00:00 committed by Benjamin Kosnik
parent 32273f9fa6
commit a1adedd03b
3 changed files with 58 additions and 13 deletions
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7
libstdc++-v3/ChangeLog
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@ -1,3 +1,10 @@
2006-09-21 Benjamin Kosnik <bkoz@redhat.com>
* include/ext/type_traits.h (__numeric_traits_integer): New.
(__numeric_traits_floating): New.
(__numeric_traits): Use them.
* testsuite/ext/type_traits.cc: New.
2006-09-21 Paolo Carlini <pcarlini@suse.de>
* include/ext/hash_map: Remove forward declaration of equality

36
libstdc++-v3/include/ext/type_traits.h
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@ -37,6 +37,7 @@
#include <utility>
#include <limits>
#include <iosfwd> // std::streamsize
#include <bits/cpp_type_traits.h>
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
@ -126,27 +127,36 @@ _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
(__glibcxx_signed(T) ? ((T)1 << __glibcxx_digits(T)) - 1 : ~(T)0)
template<typename _Value>
struct __numeric_traits
struct __numeric_traits_integer
{
typedef _Value __value_type;
// Only integer types.
static const __value_type __min = __glibcxx_min(__value_type);
static const __value_type __max = __glibcxx_max(__value_type);
// Only floating point types. See N1822.
static const std::streamsize __max_digits10 =
2 + std::numeric_limits<__value_type>::digits * 3010/10000;
// Only integers for initialization of member constant.
static const _Value __min = __glibcxx_min(_Value);
static const _Value __max = __glibcxx_max(_Value);
};
template<typename _Value>
const _Value __numeric_traits<_Value>::__min;
const _Value __numeric_traits_integer<_Value>::__min;
template<typename _Value>
const _Value __numeric_traits<_Value>::__max;
const _Value __numeric_traits_integer<_Value>::__max;
template<typename _Value>
const std::streamsize __numeric_traits<_Value>::__max_digits10;
struct __numeric_traits_floating
{
// Only floating point types. See N1822.
static const std::streamsize __max_digits10 =
2 + std::numeric_limits<_Value>::digits * 3010/10000;
};
template<typename _Value>
const std::streamsize __numeric_traits_floating<_Value>::__max_digits10;
template<typename _Value>
struct __numeric_traits
: public __conditional_type<std::__is_integer<_Value>::__value,
__numeric_traits_integer<_Value>,
__numeric_traits_floating<_Value> >::__type
{ };
_GLIBCXX_END_NAMESPACE

28
libstdc++-v3/testsuite/ext/type_traits.cc Normal file
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@ -0,0 +1,28 @@
// { dg-do compile }
// { dg-options "-pedantic" }
// -*- C++ -*-
// Copyright (C) 2006 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
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
#include <ext/type_traits.h>
using __gnu_cxx::__numeric_traits;
template struct __numeric_traits<short>;
template struct __numeric_traits<unsigned short>;
template struct __numeric_traits<double>;