int value; void do_read_value() { std::cin >> value; cv.notify_one(); } int main () { std::cout << "Please, enter an integer (I'll be printing dots): \n"; std::thread th(do_read_value); std::mutex mtx; std::unique_lock<std::mutex> lck(mtx); while (cv.wait_for(...
#include<iostream>// std::cout#include<thread>// std::thread#include<chrono>// std::chrono::seconds#include<mutex>// std::mutex, std::unique_lock#include<condition_variable>// std::condition_variable, std::cv_statusstd::condition_variable cv;intvalue;voiddo_read_value(){ std::cin >>...
= o.end()) { // there is an entry with key "foo" } // or simpler using count() int foo_present = o.count("foo"); // 1 int fob_present = o.count("fob"); // 0 // delete an entry o.erase("foo"); Conversion from STL containers Any sequence container (std::array, std...
filteris a pipe that takes a predicatepand, when it receives a valuex, sends the result on to the next pipe iifp(x)istrue. std::vector<int> input = {1,2,3,4,5,6,7,8,9,10}; std::vector<int> results; input >>= pipes::filter([](inti){returni %2==0; }) >>= pipes:...
#include <iostream> using namespace std; int main() { cout << "循环开始\n"; for (int i = 1; i <= 10; ++i) { // 初始化语句、条件判断语句和更新循环变量语句一起声明 cout << "Hello World\n"; } cout << "\n循环结束\n"; // 保持控制台窗口打开,等待用户按键 cin.get(); retu...
int numbers[] = {3, 6, 9}; 可以使用基于范围的 for 循环来显示 numbers 数组的内容。语句如下: for(intval : numbers) { cout<<"The next value is"; cout<< val <<endl; } 因为numbers 数组有 3 个元素,所以该循环将迭代 3 次。第一次它迭代时,val 变量将接收 numbers[0] 中的值;在第二次...
#include<iostream>#include<vector>#include<algorithm>usingnamespacestd;intmain(void){intn; cout <<"How many integers do you want to input? "; cin >> n;vector<int>vec(n);for(inti =0; i < vec.size(); i++) { cout <<"Index "<< i <<": "; cin >> vec[i]; }sort(vec.beg...
#include"arr.hpp"#include<iostream>intgetInteger(){intvalue;std::cout<<"Please enter integer between 10 and 20 for size of array: ";std::cin>> value;// check if size is in rangeif(value >=10&& value <=20) {returnvalue; }else{std::cout<<"Error. Please enter a...
#include "CppSQLite.h" #include <ctime> #include <iostream> using namespace std; const char* gszFile = "C:\\test.db"; int main(int argc, char** argv) { try { int i, fld; time_t tmStart, tmEnd; CppSQLiteDB db; cout << "SQLite Version: " << db.SQLiteVersion() << endl...
#include<iostream> #include<cstring> #include<vector> using namespace std; using LL = long long; int main(){ cin.tie(0); cout.tie(0); ios::sync_with_stdio(0); int T; cin >> T; while(T--){ string s; cin >> s; bool ok = false; for(int i = 1; i * 2 <= s.size...