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47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
/************************************************************************************
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*
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* D++, A Lightweight C++ library for Discord
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*
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* Copyright 2022 Craig Edwards and D++ contributors
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* (https://github.com/brainboxdotcc/DPP/graphs/contributors)
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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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* http://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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*
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************************************************************************************/
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#pragma once
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#include <dpp/export.h>
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#include <utility>
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namespace dpp {
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/**
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* @brief Run some code within an if() statement only once.
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*
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* Use this template like this:
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*
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* ```
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* if (dpp::run_once<struct any_unique_name_you_like_here>()) {
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* // Your code here
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* }
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* ```
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*
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* @tparam T any unique 'tag' identifier name
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* @return auto a true/false return to say if we should execute or not
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*/
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template <typename T> auto run_once() {
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static auto called = false;
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return !std::exchange(called, true);
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};
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};
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