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// Copyright (c) 2018 NVIDIA Corporation
// (Bryce Adelstein Lelbach <brycelelbach@gmail.com>)
// Copyright (c) 2013-2018 Eric Niebler (`THRUST_RETURNS`, etc)
// Copyright (c) 2016-2018 Casey Carter (`THRUST_RETURNS`, etc)
//
// Distributed under the Boost Software License v1.0 (boost.org/LICENSE_1_0.txt)
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/cpp11_required.h>
#if THRUST_CPP_DIALECT >= 2011
#include <thrust/detail/preprocessor.h>
#include <utility>
#include <type_traits>
///////////////////////////////////////////////////////////////////////////////
/// \def THRUST_FWD(x)
/// \brief Performs universal forwarding of a universal reference.
///
#define THRUST_FWD(x) ::std::forward<decltype(x)>(x)
/// \def THRUST_MVCAP(x)
/// \brief Capture `x` into a lambda by moving.
///
#define THRUST_MVCAP(x) x = ::std::move(x)
/// \def THRUST_RETOF(invocable, ...)
/// \brief Expands to the type returned by invoking an instance of the invocable
/// type \a invocable with parameters of type \c __VA_ARGS__. Must
/// be called with 1 or fewer parameters to the invocable.
///
#define THRUST_RETOF(...) THRUST_PP_DISPATCH(THRUST_RETOF, __VA_ARGS__)
#define THRUST_RETOF1(C) decltype(::std::declval<C>()())
#define THRUST_RETOF2(C, V) decltype(::std::declval<C>()(::std::declval<V>()))
/// \def THRUST_RETURNS(...)
/// \brief Expands to a function definition that returns the expression
/// \c __VA_ARGS__.
///
#define THRUST_RETURNS(...) \
noexcept(noexcept(__VA_ARGS__)) \
{ return (__VA_ARGS__); } \
/**/
/// \def THRUST_DECLTYPE_RETURNS(...)
/// \brief Expands to a function definition, including a trailing returning
/// type, that returns the expression \c __VA_ARGS__.
///
// Trailing return types seem to confuse Doxygen, and cause it to interpret
// parts of the function's body as new function signatures.
#if defined(THRUST_DOXYGEN)
#define THRUST_DECLTYPE_RETURNS(...) \
{ return (__VA_ARGS__); } \
/**/
#else
#define THRUST_DECLTYPE_RETURNS(...) \
noexcept(noexcept(__VA_ARGS__)) \
-> decltype(__VA_ARGS__) \
{ return (__VA_ARGS__); } \
/**/
#endif
/// \def THRUST_DECLTYPE_RETURNS_WITH_SFINAE_CONDITION(condition, ...)
/// \brief Expands to a function definition, including a trailing returning
/// type, that returns the expression \c __VA_ARGS__. It shall only
/// participate in overload resolution if \c condition is \c true.
///
// Trailing return types seem to confuse Doxygen, and cause it to interpret
// parts of the function's body as new function signatures.
#if defined(THRUST_DOXYGEN)
#define THRUST_DECLTYPE_RETURNS(...) \
{ return (__VA_ARGS__); } \
/**/
#else
#define THRUST_DECLTYPE_RETURNS_WITH_SFINAE_CONDITION(condition, ...) \
noexcept(noexcept(__VA_ARGS__)) \
-> typename std::enable_if<condition, decltype(__VA_ARGS__)>::type \
{ return (__VA_ARGS__); } \
/**/
#endif
///////////////////////////////////////////////////////////////////////////////
#endif // THRUST_CPP_DIALECT >= 2011
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