1. What is the purpose of the get_allocator function in C++ vectors? A. To allocate memory B. To retrieve the allocator used by the vector C. To deallocate memory D. To resize the vector Show Answer 2. Which header file must be included to use std::vector in C++? A. <...
allocator_typeget_allocator()const:给容器分配空间 std::vector<int> myvector;int* p;unsignedinti; p = myvector.get_allocator().allocate(5);for(i=0; i<5; i++) myvector.get_allocator().construct(&p[i],i); std::cout <<"The allocated array contains:";for(i=0; i<5; i++) std...
Allocator get_allocator用的不是特别多,我们把使用方法讲一下。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 vector<int> myvector; int * p; unsigned int i; // 使用Allocator为数组分配5个元素的空间 p = myvector.get_allocator().allocate(5); for (i=0; i<5; i++) myvector.get_allo...
get_allocator:获取分配器对象_M_data_allocator; _M_allocate:通过分配器对象_M_data_allocator分配大小为n个的元素类型大小内存空间; _M_deallocate:释放指定数据元素类型指针地址大小为n个数据元素类型大小的内存空间; 此外还提供特化版本_Vector_alloc_base<_Tp, _Allocator,true>,该分配模板基类内部不再使用分配...
std::vector<T,Allocator>::get_allocator C++ 容器库 std::vector allocator_type get_allocator()const; (C++11 前) allocator_type get_allocator()constnoexcept; (C++11 起) (C++20 前) constexprallocator_type get_allocator()constnoexcept;
// vector::get_allocator#include <iostream>#include <vector>intmain () { std::vector<int> myvector;int* p;unsignedinti;// allocate an array with space for 5 elements using vector's allocator:p = myvector.get_allocator().allocate(5);// construct values in-place on the array:for(i=...
get_allocator() // 返回配置器 string::npos//常数,本身值为-1,无符号整型,也可以是4294967285,作为find函数失配时的返回值。 find()//str.find(str2,pos),从str的pos号位开始匹配str2,str2是str子串时返回第一次出现位置,不是子串返回string:npos,无pos从头开始。
get_allocator() :返回配置器 寻找子串 1.find函数 形式1:str.find(string s) 或者 str.find(char s) 形式2:str.find(string s, int pos) 或者 str.find(char s, int pos) 返回值:返回字符或字符串s在字符串str中第一次出现的下标,从0开始。
vector<int> myvector;int * p;unsigned int i;// 使用Allocator为数组分配5个元素的空间p = myvector.get_allocator().allocate(5);for (i=0; i<5; i++) myvector.get_allocator().construct(&p[i],i);std::cout << "The allocated array contains:";for (i=0; i<5; i++) std::cout ...
vector::get_allocator vector::insert vector::iterator vector::max_size vector::operator[] vector::operator= vector::pointer vector::pop_back vector::push_back vector::rbegin vector::reference vector::rend vector::reserve vector::resize vector::reverse_iterator vector::shrink_to_fit vector::size...