/*=============================================================================
|
Copyright (c) 2016 Paul Fultz II
|
config.hpp
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
==============================================================================*/
|
|
#ifndef BOOST_HOF_GUARD_CONFIG_HPP
|
#define BOOST_HOF_GUARD_CONFIG_HPP
|
|
// Unpack has extra checks to ensure that the function will be invoked with
|
// the sequence. This extra check can help improve error reporting but it can
|
// slow down compilation. This is enabled by default.
|
#ifndef BOOST_HOF_CHECK_UNPACK_SEQUENCE
|
#define BOOST_HOF_CHECK_UNPACK_SEQUENCE 1
|
#endif
|
|
// Check for std version
|
#if __cplusplus >= 201606
|
#define BOOST_HOF_HAS_STD_17 1
|
#else
|
#define BOOST_HOF_HAS_STD_17 0
|
#endif
|
|
#if __cplusplus >= 201402
|
#define BOOST_HOF_HAS_STD_14 1
|
#else
|
#define BOOST_HOF_HAS_STD_14 0
|
#endif
|
|
#if __cplusplus >= 201103
|
#define BOOST_HOF_HAS_STD_11 1
|
#else
|
#define BOOST_HOF_HAS_STD_11 0
|
#endif
|
|
|
// This determines if it safe to use inheritance for EBO. On every platform
|
// except clang, compilers have problems with ambigous base conversion. So
|
// this configures the library to use a different technique to achieve empty
|
// optimization.
|
#ifndef BOOST_HOF_HAS_EBO
|
#ifdef __clang__
|
#define BOOST_HOF_HAS_EBO 1
|
#else
|
#define BOOST_HOF_HAS_EBO 0
|
#endif
|
#endif
|
|
// This configures the library whether expression sfinae can be used to detect
|
// callability of a function.
|
#ifndef BOOST_HOF_NO_EXPRESSION_SFINAE
|
#ifdef _MSC_VER
|
#define BOOST_HOF_NO_EXPRESSION_SFINAE 1
|
#else
|
#define BOOST_HOF_NO_EXPRESSION_SFINAE 0
|
#endif
|
#endif
|
|
// This configures the library to use manual type deduction in a few places
|
// where it problematic on a few platforms.
|
#ifndef BOOST_HOF_HAS_MANUAL_DEDUCTION
|
#if (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 8)
|
#define BOOST_HOF_HAS_MANUAL_DEDUCTION 1
|
#else
|
#define BOOST_HOF_HAS_MANUAL_DEDUCTION 0
|
#endif
|
#endif
|
|
// Whether the compiler has relaxed constexpr.
|
#ifndef BOOST_HOF_HAS_RELAXED_CONSTEXPR
|
#ifdef __cpp_constexpr
|
#if __cpp_constexpr >= 201304
|
#define BOOST_HOF_HAS_RELAXED_CONSTEXPR 1
|
#else
|
#define BOOST_HOF_HAS_RELAXED_CONSTEXPR 0
|
#endif
|
#else
|
#define BOOST_HOF_HAS_RELAXED_CONSTEXPR BOOST_HOF_HAS_STD_14
|
#endif
|
#endif
|
|
// Whether the compiler supports generic lambdas
|
#ifndef BOOST_HOF_HAS_GENERIC_LAMBDA
|
#if defined(__cpp_generic_lambdas) || defined(_MSC_VER)
|
#define BOOST_HOF_HAS_GENERIC_LAMBDA 1
|
#else
|
#define BOOST_HOF_HAS_GENERIC_LAMBDA BOOST_HOF_HAS_STD_14
|
#endif
|
#endif
|
|
// Whether the compiler supports constexpr lambdas
|
#ifndef BOOST_HOF_HAS_CONSTEXPR_LAMBDA
|
#if defined(__cpp_constexpr) && __cpp_constexpr >= 201603
|
#define BOOST_HOF_HAS_CONSTEXPR_LAMBDA 1
|
#else
|
#define BOOST_HOF_HAS_CONSTEXPR_LAMBDA BOOST_HOF_HAS_STD_17
|
#endif
|
#endif
|
|
// Whether the compiler supports inline variables
|
#ifndef BOOST_HOF_HAS_INLINE_VARIABLES
|
#if defined(__cpp_inline_variables)
|
#define BOOST_HOF_HAS_INLINE_VARIABLES 1
|
#else
|
#define BOOST_HOF_HAS_INLINE_VARIABLES BOOST_HOF_HAS_STD_17
|
#endif
|
#endif
|
|
// Whether inline variables defined with lambdas have external linkage.
|
// Currently, no compiler supports this yet.
|
#ifndef BOOST_HOF_HAS_INLINE_LAMBDAS
|
#define BOOST_HOF_HAS_INLINE_LAMBDAS 0
|
#endif
|
|
// Whether the compiler supports variable templates
|
#ifndef BOOST_HOF_HAS_VARIABLE_TEMPLATES
|
#if defined(__clang__) && __clang_major__ == 3 && __clang_minor__ < 5
|
#define BOOST_HOF_HAS_VARIABLE_TEMPLATES 0
|
#elif defined(__cpp_variable_templates)
|
#define BOOST_HOF_HAS_VARIABLE_TEMPLATES 1
|
#else
|
#define BOOST_HOF_HAS_VARIABLE_TEMPLATES BOOST_HOF_HAS_STD_14
|
#endif
|
#endif
|
|
// Whether a constexpr function can use a void return type
|
#ifndef BOOST_HOF_NO_CONSTEXPR_VOID
|
#if BOOST_HOF_HAS_RELAXED_CONSTEXPR
|
#define BOOST_HOF_NO_CONSTEXPR_VOID 0
|
#else
|
#define BOOST_HOF_NO_CONSTEXPR_VOID 1
|
#endif
|
#endif
|
|
// Whether to use template aliases
|
#ifndef BOOST_HOF_HAS_TEMPLATE_ALIAS
|
#if defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 8
|
#define BOOST_HOF_HAS_TEMPLATE_ALIAS 0
|
#else
|
#define BOOST_HOF_HAS_TEMPLATE_ALIAS 1
|
#endif
|
#endif
|
|
// Whether evaluations of function in brace initialization is ordered from
|
// left-to-right.
|
#ifndef BOOST_HOF_NO_ORDERED_BRACE_INIT
|
#if (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 9) || defined(_MSC_VER)
|
#define BOOST_HOF_NO_ORDERED_BRACE_INIT 1
|
#else
|
#define BOOST_HOF_NO_ORDERED_BRACE_INIT 0
|
#endif
|
#endif
|
|
// Whether the compiler has trouble mangling some expressions used in
|
// decltype.
|
#ifndef BOOST_HOF_HAS_MANGLE_OVERLOAD
|
#if defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7
|
#define BOOST_HOF_HAS_MANGLE_OVERLOAD 0
|
#else
|
#define BOOST_HOF_HAS_MANGLE_OVERLOAD 1
|
#endif
|
#endif
|
|
// Whether an incomplete 'this' pointer can be used in a trailing decltype.
|
#ifndef BOOST_HOF_HAS_COMPLETE_DECLTYPE
|
#if !BOOST_HOF_HAS_MANGLE_OVERLOAD || (defined(__GNUC__) && !defined (__clang__))
|
#define BOOST_HOF_HAS_COMPLETE_DECLTYPE 0
|
#else
|
#define BOOST_HOF_HAS_COMPLETE_DECLTYPE 1
|
#endif
|
#endif
|
|
// Whether function will deduce noexcept from an expression
|
#ifndef BOOST_HOF_HAS_NOEXCEPT_DEDUCTION
|
#if defined(__GNUC__) && !defined (__clang__) && ((__GNUC__ == 4 && __GNUC_MINOR__ < 8) || (__GNUC__ == 7 && __GNUC_MINOR__ == 1))
|
#define BOOST_HOF_HAS_NOEXCEPT_DEDUCTION 0
|
#else
|
#define BOOST_HOF_HAS_NOEXCEPT_DEDUCTION 1
|
#endif
|
#endif
|
|
// Some type expansion failures on gcc 4.6
|
#ifndef BOOST_HOF_NO_TYPE_PACK_EXPANSION_IN_TEMPLATE
|
#if defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7
|
#define BOOST_HOF_NO_TYPE_PACK_EXPANSION_IN_TEMPLATE 1
|
#else
|
#define BOOST_HOF_NO_TYPE_PACK_EXPANSION_IN_TEMPLATE 0
|
#endif
|
#endif
|
|
// Whether to use std::default_constructible, it is a little buggy on gcc 4.6.
|
#ifndef BOOST_HOF_NO_STD_DEFAULT_CONSTRUCTIBLE
|
#if defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7
|
#define BOOST_HOF_NO_STD_DEFAULT_CONSTRUCTIBLE 1
|
#else
|
#define BOOST_HOF_NO_STD_DEFAULT_CONSTRUCTIBLE 0
|
#endif
|
#endif
|
|
#endif
|
