* Return: EXIT_FAILURE if malloc failed. Otherwise EXIT_SUCCESS */intmain(void){char*s;s=strdup("Holberton");if(s==NULL){fprintf(stderr,"Can't allocate mem with malloc\n");return(EXIT_FAILURE);}printf("%p\n",(void*)s);return(EXIT_SUCCESS);} strdup 继续阅读本文前,请想一想strdup...
// thread example #include <iostream> // std::cout #include <thread> // std::thread #include <stdio.h> void foo() { // do stuff... printf("foo executed!\n"); } void bar(int x) { // do stuff... printf("bar executed!\n"); } int main() { std::thread first (foo); ...
1.解释一下什么是缓冲区: 缓冲区简单来说是内存空间的一部分。也就是说,在内存空间中预留了一定的存储空间,这些存储空间用来缓冲输入或输出的数据,这部分预留的空间就叫做缓冲区。 2.缓冲区作用 简单可记为使低速的输入输出设备和高速的CPU能够协调工作,避免低速的输入输出设备占用CPU,解放出CPU,使其能够高效率工...
("client1");21client.connect("broker.hivemq.com");22client.loop_start();23while(true) {24client.publish(NULL,"test/topic", strlen("Hello, MQTT!"),"Hello, MQTT!");25std::this_thread::sleep_for(std::chrono::seconds(1));26}27client.loop_stop();28client.disconnect();29return0;30...
std::string s = fmt::format("{0} {1} {0}","Hello","world");// 使用命名参数fmt::print("Hello, {name}! The answer is {number}. Goodbye, {name}.",fmt::arg("name","World"), fmt::arg("number",42)); 2.3.3 正则表达式 ...
format std::wstring fscanf - reading "comma seperted file" Full working example to capture screen using DirectX Function error "already has a body" Function template instantation & export from DLL fwrite issues with large data write GDI resource monitoring Get COM port number in Visual C++ Get...
协程(coroutine)顾名思义就是“协作的例程”(co-operative routines)。跟具有操作系统概念的线程不一样,协程是在用户空间利用程序语言的语法语义就能实现逻辑上类似多任务的编程技巧。实际上协程的概念比线程还要早,按照 Knuth 的说法“子例程是协程的特例”,一个子例程就是一次子函数调用,那么实际上协程就是类函数一...
std::ref(value));// 通过移动语义传递std::threadthreadByMove(threadFuncByMove,std::move(greeting));threadByValue.join();threadByReference.join();threadByMove.join();std::cout<<"Main Thread: "<<value<<std::endl;return0;}
#include <stdio.h>#include <regex.h>int main(void){ regex_t regex; int reti; char msgbuf[100]; const char *pattern ="(.*)"; char *data ="ExampleHello World!"; reti = regcomp(®ex, pattern, REG_EXTENDED); if (reti){ fprintf(stderr,"Could not compile regex\n")...
// mutex example #include <iostream> // std::cout #include <thread> // std::thread #include <mutex> // std::mutex std::mutex mtx; // mutex forcritical sectionvoid print_block (int n, char c) { // critical section (exclusive access to std::cout signaled by locking mtx): ...