全部代码
#pragma once#include <new>#include "type_traits.h"
#include "iterator.h"namespace tinySTL {// constructtemplate<typename T>void construct(T* p) {::new((void*)p) T();}template<typename T1, typename T2>void construct(T1* p, const T2& val) {::new((void*)p) T1(val);}template<typename T, typename... Args>void construct(T* p, Args&&... args) {::new((void*)p) T(tinySTL::forward<Args>(args)...);}// destroytemplate<typename T>void destroy_one(T*, std::true_type) {}template<typename T>void destroy_one(T* pointer, std::false_type) {if (pointer)pointer->~T(); // 执行自定义的析构函数，否则不处理}template<typename ForwardIter>void destroy_cat(ForwardIter, ForwardIter, std::true_type) {}template<typename ForwardIter>void destroy_cat(ForwardIter first, ForwardIter last, std::false_type) {for (; first != last; ++first)destroy(&*first);}template<typename T>void destroy(T* pointer) {destroy_one(pointer, std::is_trivially_destructible<T>{});}template<typename ForwardIter>void destroy(ForwardIter first, ForwardIter last) {destroy_cat(first, last, std::is_trivially_destructible<typename iterator_traits<ForwardIter>::value_type>{});}}