Question

我试图为以下函数创建线程

void SortingCompetition::masterSort(int low, int high)

像这样：

  thread a(&SortingCompetition::masterSort,this, low, j-1);
    thread b (&SortingCompetition::masterSort,this, j+1,high);

并收到以下错误。

sortingcompetition.cpp:55:16: error: no matching constructor for initialization
  of 'std::__1::thread'
    thread b (&SortingCompetition::masterSort,this, j+1,high);
           ^  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:374:9: note: 
  candidate constructor template not viable: requires single argument '__f',
  but 4 arguments were provided
thread::thread(_Fp __f)
    ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:263:5: note: 
  candidate constructor not viable: requires 1 argument, but 4 were provided
thread(const thread&);
^
   /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/thread:270:5: note: 
  candidate constructor not viable: requires 0 arguments, but 4 were
  provided
thread() _NOEXCEPT : __t_(0) {}

我是线程的新手，所以我不知道该怎么做。

Answer 1

您需要bind方法，如：

thread a(std::bind(&SortingCompetition::masterSort, this, std::placeholders::_1, std::placeholders::_2),low,j-1);

备选您可以使用函数或静态方法。原因是，保留了this指针的到期绑定。要调用非静态实例的方法，需要this指针。使用std::bind即可完成此操作。 std::bind现在需要该方法有多少参数，即占位符进入游戏的位置。

成员函数的线程

1 个答案: