if块内std :: lock_guard的范围 [英] scope of std::lock_guard inside if block
本文介绍了if块内std :: lock_guard的范围的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
当前正在研究 std :: mutex ，希望获得一些帮助.如果我的代码看起来像-
Currently studying about std::mutex and would love some help. If I've a code that looks like -
....
if(returnBoolValue())
{
std::lock_guard<std::mutex> lock(mutex_var);
....
....
}
....
std :: lock_guard 是否在保护if条件下返回值的函数?IE. returnBoolValue()
is the std::lock_guard guarding the function returning the value inside if condition? ie. returnBoolValue()
如果可能的话，我应该如何改进它以使函数调用也处于保护范围之内?
And how should I improve it so that function call is inside the guard as well, if possible?
-
std :: mutex- http://en.cppreference.com/w/cpp/thread/mutex -
std :: lock_guard- http://en.cppreference.com/w/cpp/thread/lock_guard
推荐答案
当前，如果不添加其他作用域，则无法执行此操作(C ++ 17可以执行此操作)
Currently it's not possible to do this without adding another scope (C++17 has a way to do this)
一个解决方案是
....
{
std::lock_guard<std::mutex> lock(mutex_var);
if(returnBoolValue())
{
....
....
}
}
....
C ++ 17种方式:
C++ 17 way:
....
if(std::lock_guard<std::mutex> lock(mutex_var); returnBoolValue())
{
....
....
}
....
这篇关于if块内std :: lock_guard的范围的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
