"fmingu" <
fmingu@...> wrote in message
news:
31100020.905591247202195143.JavaMail.coremail@......
>After your advice,I wrote the following test program:
>int main(int argc, char *argv[])
>{
> int nnumber=7;
> int switchvalue=1;
> if_then_else(var(nnumber)==6, var(switchvalue)=3
> ,var(switchvalue)=30);
> std::cout<<" the nnumber is "<<nnumber<<" and switchvalue is
> "<<switchvalue<<"\n";
> system("PAUSE");
> return 0;
>}
>and the result is:
>the nnumber is 7 and and switchvalue is 1
>Even
>if_then_else(var(nnumber)==6, var(switchvalue)=constant(3)
> ,var(switchvalue)=constant(30));
>get the same result.
>
>the value in the lambda expression did not saved.
>Can you tell me why?
if_then_else only creates and returns a lambda function object.
>And How can I correct it?
You need to apply it (note invoking the fn call operator):
if_then_else(var(nnumber)==6, var(switchvalue)=3
,var(switchvalue)=30)();
HTH / Johan
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