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// Copyright 2019 The Marl Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef marl_defer_h
#define marl_defer_h
#include "finally.h"
namespace marl {
#define MARL_CONCAT_(a, b) a##b
#define MARL_CONCAT(a, b) MARL_CONCAT_(a, b)
// defer() is a macro to defer execution of a statement until the surrounding
// scope is closed and is typically used to perform cleanup logic once a
// function returns.
//
// Note: Unlike golang's defer(), the defer statement is executed when the
// surrounding *scope* is closed, not necessarily the function.
//
// Example usage:
//
// void sayHelloWorld()
// {
// defer(printf("world\n"));
// printf("hello ");
// }
//
#define defer(x) \
auto MARL_CONCAT(defer_, __LINE__) = marl::make_finally([&] { x; })
} // namespace marl
#endif // marl_defer_h