Reference Constructors vector Constructs a vector of a specific size or with elements of a specific value or with a specific allocator or as a copy of some other vector. Typedefs allocator_type A type that represents the allocator class for the vecto
1,最通用的模板交换函数模式:创建临时对象,调用对象的赋值操作符. template <class T> void swap ( T& a, T& b ) { T c(a); a=b; b=c; } 需要构建临时对象,一个拷贝构造,两次赋值操作. 2,针对int型优化: void swap(int & __restrict a, int & __restrict b) { a ^= b; b ^= a; a ^= b; } 无需构造临时对象,异或 因为指针是in
//vector< T> vec; //构造一个名为vec的储存数据类型为T的动态数组.其中T为需要储存的数据类型 //初始时vec为空 //push_back 末尾添加一个元素 //pop_back 在末尾弹出一个元素 //size 获取长度 size_type size() const; Return size Returns the number of elements in the vector. This is the number of actual objects held in