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File cpp_type_traits.h

// The  -*- C++ -*- type traits classes for internal use in libstdc++

// Copyright (C) 2000-2018 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file bits/cpp_type_traits.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{ext/type_traits}
 */

// Written by Gabriel Dos Reis <dosreis@cmla.ens-cachan.fr>

#ifndef _CPP_TYPE_TRAITS_H
#define _CPP_TYPE_TRAITS_H 1

#pragma GCC system_header

#include <bits/c++config.h>

//
// This file provides some compile-time information about various types.
// These representations were designed, on purpose, to be constant-expressions
// and not types as found in <bits/type_traits.h>.  In particular, they
// can be used in control structures and the optimizer hopefully will do
// the obvious thing.
//
// Why integral expressions, and not functions nor types?
// Firstly, these compile-time entities are used as template-arguments
// so function return values won't work:  We need compile-time entities.
// We're left with types and constant  integral expressions.
// Secondly, from the point of view of ease of use, type-based compile-time
// information is -not- *that* convenient.  On has to write lots of
// overloaded functions and to hope that the compiler will select the right
// one. As a net effect, the overall structure isn't very clear at first
// glance.
// Thirdly, partial ordering and overload resolution (of function templates)
// is highly costly in terms of compiler-resource.  It is a Good Thing to
// keep these resource consumption as least as possible.
//
// See valarray_array.h for a case use.
//
// -- Gaby (dosreis@cmla.ens-cachan.fr) 2000-03-06.
//
// Update 2005: types are also provided and <bits/type_traits.h> has been
// removed.
//

extern "C++" {

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

struct __true_type { };
  struct __false_type { };

template<bool>
    struct __truth_type
    { typedef __false_type __type; };

template<>
    struct __truth_type<true>
    { typedef __true_type __type; };

// N.B. The conversions to bool are needed due to the issue
  // explained in c++/19404.
  template<class _Sp, class _Tp>
    struct __traitor
    {
      enum { __value = bool(_Sp::__value) || bool(_Tp::__value) };
      typedef typename __truth_type<__value>::__type __type;
    };

// Compare for equality of types.
  template<typename, typename>
    struct __are_same
    {
      enum { __value = 0 };
      typedef __false_type __type;
    };

template<typename _Tp>
    struct __are_same<_Tp, _Tp>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

// Holds if the template-argument is a void type.
  template<typename _Tp>
    struct __is_void
    {
      enum { __value = 0 };
      typedef __false_type __type;
    };

template<>
    struct __is_void<void>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

//
  // Integer types
  //
  template<typename _Tp>
    struct __is_integer
    {
      enum { __value = 0 };
      typedef __false_type __type;
    };

// Thirteen specializations (yes there are eleven standard integer
  // types; <em>long long</em> and <em>unsigned long long</em> are
  // supported as extensions).  Up to four target-specific __int<N>
  // types are supported as well.
  template<>
    struct __is_integer<bool>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<char>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<signed char>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<unsigned char>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

# ifdef _GLIBCXX_USE_WCHAR_T
  template<>
    struct __is_integer<wchar_t>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };
# endif

#if __cplusplus >= 201103L
  template<>
    struct __is_integer<char16_t>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<char32_t>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };
#endif

template<>
    struct __is_integer<short>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<unsigned short>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<int>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<unsigned int>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<long>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<unsigned long>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<long long>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_integer<unsigned long long>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

#define __INT_N(TYPE) 			\
  template<>				\
    struct __is_integer<TYPE>		\
    {					\
      enum { __value = 1 };		\
      typedef __true_type __type;	\
    };					\
  template<>				\
    struct __is_integer<unsigned TYPE>	\
    {					\
      enum { __value = 1 };		\
      typedef __true_type __type;	\
    };

#ifdef __GLIBCXX_TYPE_INT_N_0
__INT_N(__GLIBCXX_TYPE_INT_N_0)
#endif
#ifdef __GLIBCXX_TYPE_INT_N_1
__INT_N(__GLIBCXX_TYPE_INT_N_1)
#endif
#ifdef __GLIBCXX_TYPE_INT_N_2
__INT_N(__GLIBCXX_TYPE_INT_N_2)
#endif
#ifdef __GLIBCXX_TYPE_INT_N_3
__INT_N(__GLIBCXX_TYPE_INT_N_3)
#endif

#undef __INT_N

//
  // Floating point types
  //
  template<typename _Tp>
    struct __is_floating
    {
      enum { __value = 0 };
      typedef __false_type __type;
    };

// three specializations (float, double and 'long double')
  template<>
    struct __is_floating<float>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_floating<double>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_floating<long double>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

//
  // Pointer types
  //
  template<typename _Tp>
    struct __is_pointer
    {
      enum { __value = 0 };
      typedef __false_type __type;
    };

template<typename _Tp>
    struct __is_pointer<_Tp*>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

//
  // An arithmetic type is an integer type or a floating point type
  //
  template<typename _Tp>
    struct __is_arithmetic
    : public __traitor<__is_integer<_Tp>, __is_floating<_Tp> >
    { };

//
  // A scalar type is an arithmetic type or a pointer type
  // 
  template<typename _Tp>
    struct __is_scalar
    : public __traitor<__is_arithmetic<_Tp>, __is_pointer<_Tp> >
    { };

//
  // For use in std::copy and std::find overloads for streambuf iterators.
  //
  template<typename _Tp>
    struct __is_char
    {
      enum { __value = 0 };
      typedef __false_type __type;
    };

template<>
    struct __is_char<char>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

#ifdef _GLIBCXX_USE_WCHAR_T
  template<>
    struct __is_char<wchar_t>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };
#endif

template<typename _Tp>
    struct __is_byte
    {
      enum { __value = 0 };
      typedef __false_type __type;
    };

template<>
    struct __is_byte<char>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_byte<signed char>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

template<>
    struct __is_byte<unsigned char>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };

#if __cplusplus >= 201703L
  enum class byte : unsigned char;

template<>
    struct __is_byte<byte>
    {
      enum { __value = 1 };
      typedef __true_type __type;
    };
#endif // C++17

//
  // Move iterator type
  //
  template<typename _Tp>
    struct __is_move_iterator
    {
      enum { __value = 0 };
      typedef __false_type __type;
    };

// Fallback implementation of the function in bits/stl_iterator.h used to
  // remove the move_iterator wrapper.
  template<typename _Iterator>
    inline _Iterator
    __miter_base(_Iterator __it)
    { return __it; }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
} // extern "C++"

#endif //_CPP_TYPE_TRAITS_H

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
..	DIR	-	drwxr-xr-x	2025-08-28 10:58:25
algorithmfwd.h	text/x-c	21.23 KB	-rw-r--r--	2025-08-26 09:45:00
alloc_traits.h	text/x-c	19.6 KB	-rw-r--r--	2025-08-26 09:45:00
allocated_ptr.h	text/plain	3.22 KB	-rw-r--r--	2025-08-26 09:45:00
allocator.h	text/x-c	7.39 KB	-rw-r--r--	2025-08-26 09:45:00
atomic_base.h	text/x-c	23.28 KB	-rw-r--r--	2025-08-26 09:45:00
atomic_futex.h	text/x-c	9.35 KB	-rw-r--r--	2025-08-26 09:45:00
atomic_lockfree_defines.h	text/plain	2.2 KB	-rw-r--r--	2025-08-26 09:45:07
basic_ios.h	text/x-c	15.7 KB	-rw-r--r--	2025-08-26 09:45:00
basic_ios.tcc	text/plain	5.94 KB	-rw-r--r--	2025-08-26 09:45:00
basic_string.h	text/x-c	237.01 KB	-rw-r--r--	2025-08-26 09:45:00
basic_string.tcc	text/x-c	52.5 KB	-rw-r--r--	2025-08-26 09:45:00
boost_concept_check.h	text/x-c++	26.52 KB	-rw-r--r--	2025-08-26 09:45:00
c++0x_warning.h	text/plain	1.44 KB	-rw-r--r--	2025-08-26 09:45:00
char_traits.h	text/x-c	20.42 KB	-rw-r--r--	2025-08-26 09:45:00
codecvt.h	text/plain	20.79 KB	-rw-r--r--	2025-08-26 09:45:00
concept_check.h	text/x-c	3.34 KB	-rw-r--r--	2025-08-26 09:45:00
cpp_type_traits.h	text/x-c	9.56 KB	-rw-r--r--	2025-08-26 09:45:00
cxxabi_forced.h	text/plain	1.77 KB	-rw-r--r--	2025-08-26 09:45:07
cxxabi_init_exception.h	text/x-c	2.17 KB	-rw-r--r--	2025-08-26 09:45:07
deque.tcc	text/plain	33.32 KB	-rw-r--r--	2025-08-26 09:45:00
enable_special_members.h	text/plain	12.1 KB	-rw-r--r--	2025-08-26 09:45:00
exception.h	text/x-c	2.23 KB	-rw-r--r--	2025-08-26 09:45:07
exception_defines.h	text/plain	1.61 KB	-rw-r--r--	2025-08-26 09:45:07
exception_ptr.h	text/x-c	5.84 KB	-rw-r--r--	2025-08-26 09:45:07
forward_list.h	text/x-c	47.77 KB	-rw-r--r--	2025-08-26 09:45:00
forward_list.tcc	text/plain	12.86 KB	-rw-r--r--	2025-08-26 09:45:00
fs_dir.h	text/plain	14.38 KB	-rw-r--r--	2025-08-26 09:45:00
fs_fwd.h	text/x-c	10.04 KB	-rw-r--r--	2025-08-26 09:45:00
fs_ops.h	text/x-c	9.5 KB	-rw-r--r--	2025-08-26 09:45:00
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fstream.tcc	text/x-c	32.03 KB	-rw-r--r--	2025-08-26 09:45:00
functexcept.h	text/x-c	3.18 KB	-rw-r--r--	2025-08-26 09:45:00
functional_hash.h	text/x-c	8.04 KB	-rw-r--r--	2025-08-26 09:45:00
gslice.h	text/plain	5.39 KB	-rw-r--r--	2025-08-26 09:45:00
gslice_array.h	text/plain	7.59 KB	-rw-r--r--	2025-08-26 09:45:00
hash_bytes.h	text/x-c	2.1 KB	-rw-r--r--	2025-08-26 09:45:07
hashtable.h	text/x-c	72.06 KB	-rw-r--r--	2025-08-26 09:45:00
hashtable_policy.h	text/x-c	66.38 KB	-rw-r--r--	2025-08-26 09:45:00
indirect_array.h	text/plain	7.68 KB	-rw-r--r--	2025-08-26 09:45:00
invoke.h	text/x-c	3.57 KB	-rw-r--r--	2025-08-26 09:45:00
ios_base.h	text/x-c	30.3 KB	-rw-r--r--	2025-08-26 09:45:00
istream.tcc	text/x-c	30.36 KB	-rw-r--r--	2025-08-26 09:45:00
list.tcc	text/plain	15.6 KB	-rw-r--r--	2025-08-26 09:45:00
locale_classes.h	text/x-c	24.31 KB	-rw-r--r--	2025-08-26 09:45:00
locale_classes.tcc	text/plain	8.18 KB	-rw-r--r--	2025-08-26 09:45:00
locale_conv.h	text/x-c	15.72 KB	-rw-r--r--	2025-08-26 09:45:00
locale_facets.h	text/x-c	90.16 KB	-rw-r--r--	2025-08-26 09:45:00
locale_facets.tcc	text/plain	38.62 KB	-rw-r--r--	2025-08-26 09:45:00
locale_facets_nonio.h	text/x-c	67.36 KB	-rw-r--r--	2025-08-26 09:45:00
locale_facets_nonio.tcc	text/plain	44.22 KB	-rw-r--r--	2025-08-26 09:45:00
localefwd.h	text/x-c	5.51 KB	-rw-r--r--	2025-08-26 09:45:00
mask_array.h	text/plain	7.42 KB	-rw-r--r--	2025-08-26 09:45:00
memoryfwd.h	text/x-c	2.4 KB	-rw-r--r--	2025-08-26 09:45:00
move.h	text/x-c	6.38 KB	-rw-r--r--	2025-08-26 09:45:00
nested_exception.h	text/x-c	4.69 KB	-rw-r--r--	2025-08-26 09:45:07
node_handle.h	text/x-c	8.02 KB	-rw-r--r--	2025-08-26 09:45:00
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parse_numbers.h	text/x-c	7.76 KB	-rw-r--r--	2025-08-26 09:45:00
postypes.h	text/x-c	8.02 KB	-rw-r--r--	2025-08-26 09:45:00
predefined_ops.h	text/plain	8.87 KB	-rw-r--r--	2025-08-26 09:45:00
ptr_traits.h	text/x-c	6.47 KB	-rw-r--r--	2025-08-26 09:45:00
quoted_string.h	text/x-c	4.93 KB	-rw-r--r--	2025-08-26 09:45:00
random.h	text/x-c	171.14 KB	-rw-r--r--	2025-08-26 09:45:00
random.tcc	text/x-c	103.12 KB	-rw-r--r--	2025-08-26 09:45:00
range_access.h	text/x-c	9.79 KB	-rw-r--r--	2025-08-26 09:45:00
refwrap.h	text/x-c	11.61 KB	-rw-r--r--	2025-08-26 09:45:00
regex.h	text/plain	95.12 KB	-rw-r--r--	2025-08-26 09:45:00
regex.tcc	text/plain	16.18 KB	-rw-r--r--	2025-08-26 09:45:00
regex_automaton.h	text/plain	10.47 KB	-rw-r--r--	2025-08-26 09:45:00
regex_automaton.tcc	text/x-Algol68	7.65 KB	-rw-r--r--	2025-08-26 09:45:00
regex_compiler.h	text/plain	17.63 KB	-rw-r--r--	2025-08-26 09:45:00
regex_compiler.tcc	text/plain	18.84 KB	-rw-r--r--	2025-08-26 09:45:00
regex_constants.h	text/plain	14.36 KB	-rw-r--r--	2025-08-26 09:45:00
regex_error.h	text/plain	4.79 KB	-rw-r--r--	2025-08-26 09:45:00
regex_executor.h	text/x-c	7.31 KB	-rw-r--r--	2025-08-26 09:45:00
regex_executor.tcc	text/plain	18.4 KB	-rw-r--r--	2025-08-26 09:45:00
regex_scanner.h	text/x-c	6.92 KB	-rw-r--r--	2025-08-26 09:45:00
regex_scanner.tcc	text/plain	14.66 KB	-rw-r--r--	2025-08-26 09:45:00
shared_ptr.h	text/x-c	22.88 KB	-rw-r--r--	2025-08-26 09:45:00
shared_ptr_atomic.h	text/x-c	9.54 KB	-rw-r--r--	2025-08-26 09:45:00
shared_ptr_base.h	text/x-c	53.01 KB	-rw-r--r--	2025-08-26 09:45:00
slice_array.h	text/plain	9.13 KB	-rw-r--r--	2025-08-26 09:45:00
specfun.h	text/x-c	45.95 KB	-rw-r--r--	2025-08-26 09:45:00
sstream.tcc	text/plain	9.9 KB	-rw-r--r--	2025-08-26 09:45:00
std_abs.h	text/x-c	3.19 KB	-rw-r--r--	2025-08-26 09:45:00
std_function.h	text/x-c	22.71 KB	-rw-r--r--	2025-08-26 09:45:00
std_mutex.h	text/x-c	9.08 KB	-rw-r--r--	2025-08-26 09:45:00
stl_algo.h	text/x-c	209.27 KB	-rw-r--r--	2025-08-26 09:45:00
stl_algobase.h	text/x-c	49.31 KB	-rw-r--r--	2025-08-26 09:45:00
stl_bvector.h	text/x-c	32.94 KB	-rw-r--r--	2025-08-26 09:45:00
stl_construct.h	text/x-c	7.22 KB	-rw-r--r--	2025-08-26 09:45:00
stl_deque.h	text/x-c	76.73 KB	-rw-r--r--	2025-08-26 09:45:00
stl_function.h	text/x-c	40.77 KB	-rw-r--r--	2025-08-26 09:45:00
stl_heap.h	text/x-c	19.73 KB	-rw-r--r--	2025-08-26 09:45:00
stl_iterator.h	text/x-c	41.3 KB	-rw-r--r--	2025-08-26 09:45:00
stl_iterator_base_funcs.h	text/x-c	7.99 KB	-rw-r--r--	2025-08-26 09:45:00
stl_iterator_base_types.h	text/x-c	8.48 KB	-rw-r--r--	2025-08-26 09:45:00
stl_list.h	text/x-c	65.97 KB	-rw-r--r--	2025-08-26 09:45:00
stl_map.h	text/x-c	51.55 KB	-rw-r--r--	2025-08-26 09:45:00
stl_multimap.h	text/x-c	40.58 KB	-rw-r--r--	2025-08-26 09:45:00
stl_multiset.h	text/x-c	34.97 KB	-rw-r--r--	2025-08-26 09:45:00
stl_numeric.h	text/x-c	13.51 KB	-rw-r--r--	2025-08-26 09:45:00
stl_pair.h	text/x-c	18.21 KB	-rw-r--r--	2025-08-26 09:45:00
stl_queue.h	text/x-c	23.51 KB	-rw-r--r--	2025-08-26 09:45:00
stl_raw_storage_iter.h	text/plain	3.74 KB	-rw-r--r--	2025-08-26 09:45:00
stl_relops.h	text/plain	4.49 KB	-rw-r--r--	2025-08-26 09:45:00
stl_set.h	text/x-c	35.28 KB	-rw-r--r--	2025-08-26 09:45:00
stl_stack.h	text/x-c	11.66 KB	-rw-r--r--	2025-08-26 09:45:00
stl_tempbuf.h	text/x-c	8.15 KB	-rw-r--r--	2025-08-26 09:45:00
stl_tree.h	text/x-c	73.15 KB	-rw-r--r--	2025-08-26 09:45:00
stl_uninitialized.h	text/x-c	27.06 KB	-rw-r--r--	2025-08-26 09:45:00
stl_vector.h	text/x-c	59.12 KB	-rw-r--r--	2025-08-26 09:45:00
stream_iterator.h	text/x-c	6.5 KB	-rw-r--r--	2025-08-26 09:45:00
streambuf.tcc	text/plain	4.81 KB	-rw-r--r--	2025-08-26 09:45:00
streambuf_iterator.h	text/x-c	13.44 KB	-rw-r--r--	2025-08-26 09:45:00
string_view.tcc	text/plain	6.54 KB	-rw-r--r--	2025-08-26 09:45:00
stringfwd.h	text/x-c	2.55 KB	-rw-r--r--	2025-08-26 09:45:00
uniform_int_dist.h	text/x-c	9.84 KB	-rw-r--r--	2025-08-26 09:45:00
unique_ptr.h	text/x-c	25.38 KB	-rw-r--r--	2025-08-26 09:45:00
unordered_map.h	text/html	73.58 KB	-rw-r--r--	2025-08-26 09:45:00
unordered_set.h	text/html	57.76 KB	-rw-r--r--	2025-08-26 09:45:00
uses_allocator.h	text/x-c	6.37 KB	-rw-r--r--	2025-08-26 09:45:00
valarray_after.h	text/plain	22.12 KB	-rw-r--r--	2025-08-26 09:45:00
valarray_array.h	text/x-c	21.3 KB	-rw-r--r--	2025-08-26 09:45:00
valarray_array.tcc	text/plain	7.08 KB	-rw-r--r--	2025-08-26 09:45:00
valarray_before.h	text/x-c	18.08 KB	-rw-r--r--	2025-08-26 09:45:00
vector.tcc	text/plain	28.95 KB	-rw-r--r--	2025-08-26 09:45:00

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