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Merge pull request #1104 from Project-OSRM/experimental/mapbox_variant
Experimental/mapbox variant
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| #ifndef MAPBOX_UTIL_VARIANT_RECURSIVE_WRAPPER_HPP | ||
| #define MAPBOX_UTIL_VARIANT_RECURSIVE_WRAPPER_HPP | ||
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| #include <utility> | ||
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| namespace mapbox { namespace util { | ||
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| template <typename T> | ||
| class recursive_wrapper | ||
| { | ||
| public: | ||
| using type = T; | ||
| private: | ||
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| T* p_; | ||
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| public: | ||
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| ~recursive_wrapper(); | ||
| recursive_wrapper(); | ||
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| recursive_wrapper(recursive_wrapper const& operand); | ||
| recursive_wrapper(T const& operand); | ||
| recursive_wrapper(recursive_wrapper&& operand); | ||
| recursive_wrapper(T&& operand); | ||
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| private: | ||
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| void assign(const T& rhs); | ||
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| public: | ||
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| inline recursive_wrapper& operator=(recursive_wrapper const& rhs) | ||
| { | ||
| assign( rhs.get() ); | ||
| return *this; | ||
| } | ||
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| inline recursive_wrapper& operator=(T const& rhs) | ||
| { | ||
| assign( rhs ); | ||
| return *this; | ||
| } | ||
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| inline void swap(recursive_wrapper& operand) noexcept | ||
| { | ||
| T* temp = operand.p_; | ||
| operand.p_ = p_; | ||
| p_ = temp; | ||
| } | ||
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| recursive_wrapper& operator=(recursive_wrapper&& rhs) noexcept | ||
| { | ||
| swap(rhs); | ||
| return *this; | ||
| } | ||
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| recursive_wrapper& operator=(T&& rhs) | ||
| { | ||
| get() = std::move(rhs); | ||
| return *this; | ||
| } | ||
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| public: | ||
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| T& get() { return *get_pointer(); } | ||
| const T& get() const { return *get_pointer(); } | ||
| T* get_pointer() { return p_; } | ||
| const T* get_pointer() const { return p_; } | ||
| operator T const&() const { return this->get(); } | ||
| operator T&() { return this->get(); } | ||
| }; | ||
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| template <typename T> | ||
| recursive_wrapper<T>::~recursive_wrapper() | ||
| { | ||
| delete p_; | ||
| } | ||
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| template <typename T> | ||
| recursive_wrapper<T>::recursive_wrapper() | ||
| : p_(new T) | ||
| { | ||
| } | ||
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| template <typename T> | ||
| recursive_wrapper<T>::recursive_wrapper(recursive_wrapper const& operand) | ||
| : p_(new T( operand.get() )) | ||
| { | ||
| } | ||
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| template <typename T> | ||
| recursive_wrapper<T>::recursive_wrapper(T const& operand) | ||
| : p_(new T(operand)) | ||
| { | ||
| } | ||
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| template <typename T> | ||
| recursive_wrapper<T>::recursive_wrapper(recursive_wrapper&& operand) | ||
| : p_(operand.p_) | ||
| { | ||
| operand.p_ = nullptr; | ||
| } | ||
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| template <typename T> | ||
| recursive_wrapper<T>::recursive_wrapper(T&& operand) | ||
| : p_(new T( std::move(operand) )) | ||
| { | ||
| } | ||
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| template <typename T> | ||
| void recursive_wrapper<T>::assign(const T& rhs) | ||
| { | ||
| this->get() = rhs; | ||
| } | ||
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| template <typename T> | ||
| inline void swap(recursive_wrapper<T>& lhs, recursive_wrapper<T>& rhs) noexcept | ||
| { | ||
| lhs.swap(rhs); | ||
| } | ||
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| }} | ||
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| #endif // MAPBOX_UTIL_VARIANT_RECURSIVE_WRAPPER_HPP |
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