I am using PPL and parallel_for syntax to have a for loop. In the capture clause, I have 3 variables, one of them is a class member. There is a compilation error due to the presence of a class member among variables in the capture clause. However, if I have this class member in lambda body, it does not compile either, and error stated is that variable in enclosing scope should be in capture clause. How to proceed? Should I copy the variable member to a local variable beforehand, and have it passed in the capture clause?
Here is the code, with formulaCommand the class member.
parallel_for (m_rowStart,m_rowEnd+1,[&functionEvaluation,varModel_,formulaCommand](int i)
{
MLEquationVariableModel model_(varModel_);
model_.addVariable("i", i);
model_.addVariable("j", 1);
MLEquationCommand* command_ = formulaCommand->duplicate(&model_);
double d = command_->execute().toDouble();
if(d==NO_VALUE)
{
functionEvaluation.local() = NO_VALUE;
}
else
{
functionEvaluation.local() += d;
}
delete command_;
});
Thanks!
You need to capture this
to access the member variables (remember that formulaCommand
is equivalent to this->formulaCommand
).
[&functionEvaluation, varModel_, this](int i) { ... }
(BTW, you should probably use a smart pointer (unique_ptr<MLEquationCommand>
) instead of manually delete
-ing the raw pointer command_
.)
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