brpc之ClosureGuard

简介

使用RAII用于闭包Closure自动执行run

结构

ClosureGuard()：构造函数，初始闭包_done为null

ClosureGuard() : _done(NULL) {}

ClosureGuard(google::protobuf::Closure* done)：构造函数，初始闭包

explicit ClosureGuard(google::protobuf::Closure* done) : _done(done) {}

~ClosureGuard()：析构函数,自动执行闭包的run方法

~ClosureGuard() 
{if (_done) {_done->Run();}
}

void reset(google::protobuf::Closure* done) ：重新设置闭包，会先执行设置前的闭包

void reset(google::protobuf::Closure* done) 
{if (_done) {_done->Run();}_done = done;
}

google::protobuf::Closure* release()：释放闭包，此时析构函数不会执行闭包的run方法

google::protobuf::Closure* release() 
{google::protobuf::Closure* const prev_done = _done;_done = NULL;return prev_done;
}

bool empty()：检查闭包是否为空

bool empty() const { return _done == NULL; }

void swap(ClosureGuard& other)：交换闭包

void swap(ClosureGuard& other) { std::swap(_done, other._done); }