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