98f029ae23
Additionally add an optional class to return found values in the tree. And a reference container (Ref) similar to std::reference_wrapper to allow storing references in containers.
41 lines
831 B
C++
41 lines
831 B
C++
#pragma once
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#include "glacier/memory/move.h"
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namespace glcr {
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template <typename T>
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class Optional {
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public:
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Optional() : empty_(nullptr), has_value_(false) {}
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Optional(const T& value) : value_(value), has_value_(true) {}
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Optional(T&& value) : value_(Move(value)), has_value_(true) {}
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Optional(const Optional&) = default;
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Optional(Optional&&) = default;
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~Optional() {
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if (has_value_) {
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value_.~T();
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}
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}
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bool empty() const { return !has_value_; }
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explicit operator bool() { return has_value_; }
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const T& value() const { return value_; }
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T&& release_value() {
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has_value_ = false;
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return Move(value_);
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}
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T* operator->() { return &value_; }
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T& operator*() { return value_; }
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private:
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union {
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T value_;
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void* empty_;
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};
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bool has_value_;
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};
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} // namespace glcr
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