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//===-- Self contained functional header ------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC_SUPPORT_CPP_FUNCTIONAL_H
#define LLVM_LIBC_SRC_SUPPORT_CPP_FUNCTIONAL_H
#include "src/__support/CPP/type_traits.h"
#include "src/__support/CPP/utility.h"
#include "src/__support/macros/attributes.h"
#include <stdint.h>
namespace __llvm_libc {
namespace cpp {
/// A function type adapted from LLVM's function_ref.
/// This class does not own the callable, so it is not in general safe to
/// store a function.
template <typename Fn> class function;
template <typename Ret, typename... Params> class function<Ret(Params...)> {
Ret (*callback)(intptr_t callable, Params... params) = nullptr;
intptr_t callable;
template <typename Callable>
LIBC_INLINE static Ret callback_fn(intptr_t callable, Params... params) {
return (*reinterpret_cast<Callable *>(callable))(
forward<Params>(params)...);
}
public:
LIBC_INLINE function() = default;
LIBC_INLINE function(decltype(nullptr)) {}
LIBC_INLINE ~function() = default;
template <typename Callable>
LIBC_INLINE function(
Callable &&callable,
// This is not the copy-constructor.
enable_if_t<!is_same<remove_cvref_t<Callable>, function>::value> * =
nullptr,
// Functor must be callable and return a suitable type.
enable_if_t<is_void_v<Ret> ||
is_convertible_v<
decltype(declval<Callable>()(declval<Params>()...)), Ret>>
* = nullptr)
: callback(callback_fn<remove_reference_t<Callable>>),
callable(reinterpret_cast<intptr_t>(&callable)) {}
LIBC_INLINE Ret operator()(Params... params) const {
return callback(callable, forward<Params>(params)...);
}
LIBC_INLINE explicit operator bool() const { return callback; }
};
} // namespace cpp
} // namespace __llvm_libc
#endif // LLVM_LIBC_SRC_SUPPORT_CPP_FUNCTIONAL_H
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