bslmf_disjunction.h

Go to the documentation of this file.

/// @file bslmf_disjunction.h
///
/// The content of this file has been pre-processed for Doxygen.
///
 
 
// bslmf_disjunction.h                                                -*-C++-*-
#ifndef INCLUDED_BSLMF_DISJUNCTION
#define INCLUDED_BSLMF_DISJUNCTION
 
#include <bsls_ident.h>
BSLS_IDENT("$Id: $")
 
/// @defgroup bslmf_disjunction bslmf_disjunction
/// @brief  Provide the logical disjunction (OR) for type traits.
/// @addtogroup bsl
/// @{
/// @addtogroup bslmf
/// @{
/// @addtogroup bslmf_disjunction
/// @{
///
/// <h1> Outline </h1>
/// * <a href="#bslmf_disjunction-purpose"> Purpose</a>
/// * <a href="#bslmf_disjunction-classes"> Classes </a>
/// * <a href="#bslmf_disjunction-description"> Description </a>
///
/// # Purpose {#bslmf_disjunction-purpose}
/// Provide the logical disjunction (OR) for type traits.
///
/// # Classes {#bslmf_disjunction-classes}
///
/// -  bsl::disjunction: forms the logical OR of the specified type traits
/// -  bsl::disjunction_v: the result value of the `disjunction` meta-function
///
/// # Description {#bslmf_disjunction-description}
/// This component makes available the functionality provided by
/// the `std::disjunction` meta-function in all C++ language modes -
/// `std::disjunction` is available only starting from C++17.
/// @}
/** @} */
/** @} */
 
/** @addtogroup bsl
 * @{
 */
/** @addtogroup bslmf
 * @{
 */
/** @addtogroup bslmf_disjunction
 * @{
 */
 
#include <bslscm_version.h>
 
#include <bsls_compilerfeatures.h>
#include <bsls_keyword.h>
#include <bsls_libraryfeatures.h>
 
#ifdef BSLS_LIBRARYFEATURES_HAS_CPP17_BASELINE_LIBRARY
#include <type_traits>
#else
#include <bslmf_conditional.h>
#include <bslmf_integralconstant.h>
#endif
 
#if BSLS_COMPILERFEATURES_SIMULATE_CPP11_FEATURES
// clang-format off
// Include version that can be compiled with C++03
// Generated on Mon Jan 13 08:31:25 2025
// Command line: sim_cpp11_features.pl bslmf_disjunction.h
 
# define COMPILING_BSLMF_DISJUNCTION_H
# include <bslmf_disjunction_cpp03.h>
# undef COMPILING_BSLMF_DISJUNCTION_H
 
// clang-format on
#else
 
namespace bsl {
 
#ifdef BSLS_LIBRARYFEATURES_HAS_CPP17_BASELINE_LIBRARY
 
using std::disjunction;
using std::disjunction_v;
 
#else
 
                         // ==================
                         // struct disjunction
                         // ==================
 
// forward declaration (required for C++03)
#if !BSLS_COMPILERFEATURES_SIMULATE_CPP11_FEATURES // $var-args=10
template <class... B>
struct disjunction;
#endif
 
// 0 args specialization
#ifdef BSLS_COMPILERFEATURES_SUPPORT_VARIADIC_TEMPLATES
template <class...>
struct disjunction : false_type {
};
#else
template <>
struct disjunction<> : false_type {
};
#endif
 
// 1 arg specialization
template <class B1>
struct disjunction<B1> : B1 {
};
 
// other cases
#if !BSLS_COMPILERFEATURES_SIMULATE_CPP11_FEATURES // $local-var-args=8
template <class B1, class B2, class... Bn>
struct disjunction<B1, B2, Bn...> :
    conditional<bool(B1::value), B1, disjunction<B2, Bn...> >::type {
};
#endif
 
#ifdef BSLS_COMPILERFEATURES_SUPPORT_VARIABLE_TEMPLATES
template <class... B>
BSLS_KEYWORD_INLINE_VARIABLE
constexpr bool disjunction_v = disjunction<B...>::value;
#endif
 
#endif
 
}  // close namespace bsl
 
#endif // End C++11 code
 
#endif
 
// ----------------------------------------------------------------------------
// Copyright 2024 Bloomberg Finance L.P.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ----------------------------- END-OF-FILE ----------------------------------
 
/** @} */
/** @} */
/** @} */