一、背景介绍： 函数指针始终不太灵活，它只能指向全局或静态函数，对于类成员函数、lambda表达式或其他可调用对象就无能为力了，因此，C++11推出了std::function与std::bind这两件大杀器，他们配合起来能够很好的替代函数指针。
#include <vector> #include <iostream> #include <cstring> #include "printer.h" using namespace std; int main() { vector<int> a = {1, 2, 3, 4, 5}; int *p = a.data(); int n = a.size(); // memset只认识char*,所以得通过sizeof(int)告诉memset是多大的数组 memset(p, -1, siz...
十:性能测试 #define_CRT_SECURE_NO_WARNINGS#include<iostream>#include<stdio.h>#include<cstring>#if_MSC_VER#definesnprintf _snprintf#endifusingnamespacestd;longget_a_target_long() {/***变量声明***/longtarget =0;/***/cout<<"targer (0~"<< RAND_MAX <<"):"; cin>>target;returntarget; ...
//程序:初始化演示 #include <cstring> #include <vector> #include <iostream> usingnamespacestd; intar[10] ={ 12, 45, 234, 64, 12, 35, 63, 23, 12, 55 }; char* str = "Hello World"; intmain(void) { vector <int> vec1(ar, ar+10);//first=ar,last=ar+10,不包括ar+10 vector...
报错原因:char * buffer = "Hello world\n"; 字符串"Hello world\n"存在于只读存储区,其内容不能被随意更改!!! 二、memcpy()函数用法 void *memcpy(void *dest, const void *src, size_t n); C语言需要包含头文件string.h;C++需要包含cstring 或 string.h。 用法...
bool operator()(CString& szStringToCompare) const { bool retVal = false; switch (m_lpFS->iMode) { case FM_IS: { retVal = (szStringToCompare == m_lpFDD->szMatchStr); break; } case FM_STARTSWITH: { retVal = (szStringToCompare.Left(m_lpFDD->szMatchStr.GetLength()) ...
练习《C++ Primer》中的3.14节时，当敲入： #include <iostream> #include <string> using namespace std; int main(){ string word; vector<string> text; while (cin >> word) text.push_back(word); return 0; } 程序会报错： error: use of undeclared identifier ...
#i nclude <cstring> // <cstring>和<string.h>相同 #i nclude <vector> using namespace std; int ar[10] = { 12, 45, 234, 64, 12, 35, 63, 23, 12, 55 }; char* str = "Hello World"; int main(int argc, char* argv[]) { vector <int> vec1(ar, ar+10); vector...
#include <cstring> int main() { char str[] = "1234567890"; std::cout << str << '\n'; std::memmove(str + 4, str, 3); // copies from [4, 5, 6] to [5, 6, 7] std::cout << str << '\n'; } 1. 2. 3.