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#include <tuple>
#include <utility>
using namespace std;
 
template<class ..._Attrs>
class VertexBuffer
{
    static constexpr const bool ownIndices = sizeof...(_Attrs) == 0;
 
    void test(){
        static_asssert(ownIndices, "Link to owned indices!!");        
    }
};
 
 
int main(){
}

prog.cpp: In member function ‘void VertexBuffer<_Attrs>::test()’:
prog.cpp:11:61: error: there are no arguments to ‘static_asssert’ that depend on a template parameter, so a declaration of ‘static_asssert’ must be available [-fpermissive]
         static_asssert(ownIndices, "Link to owned indices!!");        
                                                             ^
prog.cpp:11:61: note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing the use of an undeclared name is deprecated)

Standard output is empty