Pass a block to a C++ method from objective C

Question

I have a C++ helper class that I use with objective-C. I would like to pass the c++ class a block from a view controller (a callback) so that when it is executed I am on the mai

Answer 1

See Using a Block as a Function Argument. When declaring your method, use a syntax similar to the following to declare a block argument:

void theFunction(blockReturnType (^argumentName)(blockArgumentTypes));

A block call looks like a function call, so an implementation of theFunction above which simply calls the block and returns its result would look like this:

int theFunction(int anArgument, int (^theBlock)(int)) {
    return theBlock(anArgument);
}

This syntax will work for C, C++, and Objective-C.