how to pass argument to std::function?

Question

experimenting with c++ 11 lambdas ...

How to add a parameter to the std::function in this example?  ( and how to call such a function with arguments? )

  function<void()> run = []
  {  
    for ( long c = 0 ; c < 100 ; ++c )
      nerdscentral::performRun() ; 
  };

I want to use similar code that will run on another thread. I am hoping I can use parameters to the lambda function to pass variables to the background thread.

  std::function<void()> run = [](HWND hIn )
  {
    ::Sleep(10000) ;
    ::PostMessage(hIn, WM_CLOSE, 0, 0) ;
  };

thanks,

Answer 1

chekc this link this may help you out

http://stackoverflow.com/questions/7909719/c0x-stdfunction-as-a-method-argument

Answer 2

chekc this link this may help you out

http://stackoverflow.com/questions/7909719/c0x-stdfunction-as-a-method-argument

thank you. I need examples.  This stuff is too dense for me.

the following code does not show a syntax error in vs11, but compiles with an error C2064: term does not evaluate to a function taking 1 arguments.

  std::function<void(HWND)> run = [](HWND hIn )
  {
    ::Sleep(10000) ;
    ::PostMessage(hIn, WM_CLOSE, 0, 0) ;
  };

Error	1	error C2064: term does not evaluate to a function taking 1 arguments	C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xrefwrap	96	1	HookDllTester

_VARIADIC_EXPAND_0X(_CLASS_RESULT_TYPE, , , , )

Answer 3

On 4/16/2012 12:35 PM, Steve Richter wrote:

How to add a parameter to the std::function in this example? ( and how to call such a function with arguments? )

     function<void()>    run = []
     {
         for ( long c = 0 ; c<    100 ; ++c )
             nerdscentral::performRun() ;
     };

    function<void(long)> run = [](long bound)
    {
        for ( long c = 0 ; c < bound ; ++c )
            nerdscentral::performRun() ;
    };

run(100);

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Igor Tandetnik