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Add Optional::value_or_compute for lazy computation of default value

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Maxime Coste 2019-01-03 22:49:40 +11:00
parent 8a6a76fcd3
commit 56ee329d79
1 changed files with 3 additions and 0 deletions
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src/optional.hh
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@ -84,6 +84,9 @@ public:
template<typename U> template<typename U>
T value_or(U&& fallback) const { return m_valid ? m_value : T{std::forward<U>(fallback)}; } T value_or(U&& fallback) const { return m_valid ? m_value : T{std::forward<U>(fallback)}; }
template<typename U>
T value_or_compute(U&& compute_func) const { return m_valid ? m_value : compute_func(); }
void reset() { destruct_ifn(); m_valid = false; } void reset() { destruct_ifn(); m_valid = false; }
private: private: