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Update 3: location for uniform variable returns -1

int loc = glGetUniformLocation(this->P, "transform"); // -1

/* defs */
extern PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation;
glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)wglGetProcAddress("glGetUniformLocation");  

Update 2: Tried with glm, same result, no drawing.

Update: glGetError() gives 1282

std::cout << "\n " << glGetError(); // 0
int loc = glGetUniformLocation(this->P, "transform");
std::cout << "\n " << glGetError(); // 0
glUniformMatrix4dv(loc, 1, GL_FALSE, trans.Pointer());
std::cout << "\n " << glGetError(); // 1282