2666: 'mat4::operator []' : 6 overloads have similar conversions
        c:\documents and settings\liranuna\desktop\source\mat4.h(51): could be 'const vec4 &mat4::operator [](size_t) const'
        c:\documents and settings\liranuna\desktop\source\mat4.h(47): or       'vec4 &mat4::operator [](size_t)'
        or       'built-in C++ operator[(float *, __w64 int)'
        or       'built-in C++ operator[(const float *, __w64 int)'
        or       'built-in C++ operator[(vec4 *, __w64 int)'
        or       'built-in C++ operator[(const vec4 *, __w64 int)'
        while trying to match the argument list '(mat4, int)'