1.1 函數對象

class hello{ public:void operator()(){std::cout<<"Hello Concurrent World!"<<std::endl;} };std::thread t(hello());//error，編譯器會誤以為是hello函數std::thread t((hello())); //ok std::thread t{hello()}; //ok

1.2 例子

using namespace std; void fun1(int n) //初始化構造函數 { cout << "Thread " << n << " executing\n"; n += 10; this_thread::sleep_for(chrono::milliseconds(10)); } void fun2(int & n) //拷貝構造函數 { cout << "Thread " << n << " executing\n"; n += 20; this_thread::sleep_for(chrono::milliseconds(10)); } int test() { int n = 0; thread t1; //t1是一個空thread thread t2(fun1, n + 1); //按照值傳遞 t2.join(); cout << "n=" << n << '\n'; n = 10; thread t3(fun2, ref(n)); //引用 thread t4(move(t3)); //t4執行t3，t3不是thread t4.join(); cout << "n=" << n << '\n'; return 0; }

輸出：

Thread 1 executing n=0 Thread 10 executing n=30

1.3 lambda

void test() { auto fun = [](const char *str) {cout << str << endl; }; thread t1(fun, "hello world!"); thread t2(fun, "hello beijing!"); t1.join();t2.join(); }

輸出：

hello world! hello beijing!

1.4 可變參數

#include

int show(const char *fun, ...) { va_list ap;//指針 va_start(ap, fun);//開始 vprintf(fun, ap);//調用 va_end(ap); return 0; } int test() { thread t1(show, "%s %d %c %f", "hello world!", 100, 'A', 3.14159); t1.join(); return 0; }

輸出：

hello world! 100 A 3.141590

總結

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