Boost::Function 是對函數指針的對象化封裝，在概念上與廣義上的回調函數類似。相對于函數指針，function除了使用自由函數，還可以使用函數對象，甚至是類的成員函數，這個就很強大了哈

#include <boost/function.hpp> #include <boost/bind.hpp> #include <iostream>using namespace std;class TestA {public:void method(){cout<<"TestA: method: no arguments"<<endl;}void method(int a, int b){cout<<"TestA: method: with arguments"<<"value of a is:"<<a <<"value of b is "<<b <<endl;} };void sum(int a, int b) {int sum = a + b;cout<<"sum: "<<sum<<endl; } int main() {boost::function<void()> f;TestA test;f = boost::bind(&TestA::method, &test);f();f = boost::bind(&TestA::method, &test, 1, 2);f();f = boost::bind(&sum, 1, 2);f(); }

2. 應用：Thread封裝

在實現自定義的線程類時，曾經這么干過：定義虛函數run()，用戶自定義的CustomThread::Thread后，自己實現run()函數就OK了。 當時覺得這么做也不錯。
現在有了boost::function/boost::bind我們可以這么干：
定義一個線程類：
.h文件

#include <pthread.h> #include <string> #include <boost/function.hpp> #include <boost/bind.hpp>using namespace std; class Thread {typedef boost::function<void()> ThreadFun;public:Thread(const ThreadFun& threadFun,const string& threadName = string());pid_t getThreadId();string getThreadName();int start();private:static void* startThread(void* thread);private:pthread_t m_thread; //線程句柄pid_t m_tid; //線程IDstring m_strThreadName; //線程名稱bool m_bStarted; //線程是否啟動ThreadFun m_func; //線程處理函數 };
.cpp

#include "thread.h"Thread::Thread(const Thread::ThreadFun& threadFun, const string& threadName): m_func(threadFun), m_strThreadName(threadName) { }int Thread::start() {m_tid = pthread_create(&m_thread, NULL, &startThread, this);return 0; }void* Thread::startThread(void* obj) {Thread* thread = static_cast<Thread*>(obj);thread->m_func();return NULL; }pid_t Thread::getThreadId() {return m_tid; };string Thread::getThreadName() {return m_strThreadName; }
void ThreadProcess() {int count = 100;for (int i = 0; i < count; i++){if (i % 10 == 0) cout<<"\n";cout<<i<<"\t";} }int main() {boost::function<void()> f;f = boost::bind(&ThreadProcess); Thread thread(f, "ThreadTest");thread.start();sleep(1000*1000);return 0; }

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轉載于:https://www.cnblogs.com/mtcnn/p/9410077.html

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