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37 lines
619 B
37 lines
619 B
/*
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Helper class to set the boolean exactly when setting multiple times in a row
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(as an alternative to checking input every time before setting)
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*/
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#pragma once
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struct OnceFlag {
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OnceFlag() = default;
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OnceFlag(const OnceFlag&) = delete;
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OnceFlag(OnceFlag&&) = delete;
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explicit operator bool() const {
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return _value;
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}
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OnceFlag& operator=(bool value) {
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if (!_value) {
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_value = value;
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}
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return *this;
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}
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void set() {
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_value = true;
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}
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bool get() const {
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return _value;
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}
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private:
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bool _value { false };
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};
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