llvm/libc/src/__support/CPP/expected.h

//===-- Holds an expected or unexpected value -------------------*- 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_EXPECTED_H
#define LLVM_LIBC_SRC___SUPPORT_CPP_EXPECTED_H

#include "src/__support/macros/attributes.h"
#include "src/__support/macros/config.h"

namespace LIBC_NAMESPACE_DECL {
namespace cpp {

// This is used to hold an unexpected value so that a different constructor is
// selected.
template <class T> class unexpected { … };

template <class T> explicit unexpected(T) -> unexpected<T>;

template <class T, class E> class expected { … };

} // namespace cpp
} // namespace LIBC_NAMESPACE_DECL

#endif // LLVM_LIBC_SRC___SUPPORT_CPP_EXPECTED_H