Unrecoverable block scoping error, array of C++ functors - c++

Question

I'm trying to create an array of functors at compile time, like so: (complete file):
#include <functional>
using namespace std;
function< float( float tElevation, float pAzimuth )> colorFunctions[] = {
[]( float tElevation, float pAzimuth ) -> float {
return 2.0f ;
},
} ;
int main()
{
}
That works fine.
But as soon as you try to create a local inside the functor block, like this:
function< float( float tElevation, float pAzimuth )> colorFunctions[] = {
[]( float tElevation, float pAzimuth ) -> float {
float v = 2.0f ;
return v ;
},
} ;
You get Error 1 error C1506: unrecoverable block scoping error
How can I declare locals inside these blocks? It doesn't seem to work.

Answer 1

I can reproduce this on MSVC 2010, SP1. VS10 is known for some problems with lambdas and scoping. I've tried around a lot but found nothing beautiful. Ugly, ugly workaround that will have some initialization overhead but else work as intended:
#include <functional>
#include <boost/assign/list_of.hpp>
#include <vector>
using namespace std;
typedef function< float( float tElevation, float pAzimuth )> f3Func;
vector<f3Func const> const colorFunctions = boost::assign::list_of(
f3Func([]( float /*tElevation*/, float /*pAzimuth*/ ) -> float {
float v = 2.0f ;
return v ;
}))
([](float a, float b) -> float {
float someFloat = 3.14f;
return a*b*someFloat;
})
;
#include <iostream>
int main()
{
cout << colorFunctions[1](0.3f,0.4f) << '\n';
}

Answer 2

I compiled the following code on ubuntu 12.04 with the following line:
g++-4.7 -std=c++0x main.cpp
And it worked fine.
What platform and what compiler are you using?
#include <iostream>
#include <functional>
using namespace std;
function<float (float,float)> funcs[] = {
[] (float a, float b) -> float {
float c = 2.0f;
return c;
}
};
int main() {
std::cout << funcs[0](1,2) << std::endl;
}