initializing the array

Hello,

Considering the following code:

/// code
#include <vector>
#include <iostream>

template< int N >
class a
{
     public:
         a( const float p[] ) :
             v( &p[0], &p[0] + N )
         {
         }

         void print()
         {
             std::cout<<"Stored array = ";
             for (int i = 0; i < N; ++ i )
             {
                 std::cout<<v.at(i)<<" ";
             }
             std::cout<<std::endl;
         }

         std::vector< float > v;
};

int main()
{
     a< 2 > obj( (float[]){ 0.3, 0.5 } );
     obj.print();
}
/// end of code

when I compile using gcc with -pedantic-errors option, I get next error:
    error: ISO C++ forbids compound-literals
comeau online agrees there is a problem there.

But gcc without -pedantic-errors compiles and executes fine.

Am I causing an undefined behavior somehow?
Is there a way to do what I want, without getting that error? I need to
enable -pendantic_errors

Thank you in advance