llvm/llvm/include/llvm/ADT/STLFunctionalExtras.h

//===- llvm/ADT/STLFunctionalExtras.h - Extras for <functional> -*- 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
//
//===----------------------------------------------------------------------===//
//
// This file contains some extension to <functional>.
//
// No library is required when using these functions.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_STLFUNCTIONALEXTRAS_H
#define LLVM_ADT_STLFUNCTIONALEXTRAS_H

#include "llvm/ADT/STLForwardCompat.h"

#include <cstdint>
#include <type_traits>
#include <utility>

namespace llvm {

//===----------------------------------------------------------------------===//
//     Extra additions to <functional>
//===----------------------------------------------------------------------===//

/// An efficient, type-erasing, non-owning reference to a callable. This is
/// intended for use as the type of a function parameter that is not used
/// after the function in question returns.
///
/// This class does not own the callable, so it is not in general safe to store
/// a function_ref.
template<typename Fn> class function_ref;

function_ref<Ret (Params...)>;

} // end namespace llvm

#endif // LLVM_ADT_STLFUNCTIONALEXTRAS_H