mirror of https://github.com/bsnes-emu/bsnes.git
74 lines
2.3 KiB
C++
Executable File
74 lines
2.3 KiB
C++
Executable File
#ifndef NALL_ANY_HPP
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#define NALL_ANY_HPP
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#include <typeinfo>
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#include <nall/traits.hpp>
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namespace nall {
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struct any {
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bool empty() const { return container; }
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const std::type_info& type() const { return container ? container->type() : typeid(void); }
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template<typename T> any& operator=(const T& value_) {
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typedef typename type_if<
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std::is_array<T>::value,
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typename std::remove_extent<typename std::add_const<T>::type>::type*,
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T
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>::type auto_t;
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if(type() == typeid(auto_t)) {
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static_cast<holder<auto_t>*>(container)->value = (auto_t)value_;
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} else {
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if(container) delete container;
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container = new holder<auto_t>((auto_t)value_);
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}
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return *this;
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}
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any() : container(nullptr) {}
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~any() { if(container) delete container; }
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template<typename T> any(const T& value_) : container(nullptr) { operator=(value_); }
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private:
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struct placeholder {
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virtual const std::type_info& type() const = 0;
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} *container;
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template<typename T> struct holder : placeholder {
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T value;
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const std::type_info& type() const { return typeid(T); }
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holder(const T& value_) : value(value_) {}
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};
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template<typename T> friend T any_cast(any&);
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template<typename T> friend T any_cast(const any&);
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template<typename T> friend T* any_cast(any*);
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template<typename T> friend const T* any_cast(const any*);
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};
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template<typename T> T any_cast(any &value) {
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typedef typename std::remove_reference<T>::type nonref;
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if(value.type() != typeid(nonref)) throw;
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return static_cast<any::holder<nonref>*>(value.container)->value;
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}
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template<typename T> T any_cast(const any &value) {
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typedef const typename std::remove_reference<T>::type nonref;
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if(value.type() != typeid(nonref)) throw;
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return static_cast<any::holder<nonref>*>(value.container)->value;
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}
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template<typename T> T* any_cast(any *value) {
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if(!value || value->type() != typeid(T)) return nullptr;
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return &static_cast<any::holder<T>*>(value->container)->value;
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}
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template<typename T> const T* any_cast(const any *value) {
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if(!value || value->type() != typeid(T)) return nullptr;
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return &static_cast<any::holder<T>*>(value->container)->value;
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}
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}
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#endif
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