Rework Range cast

[kassane]

No description provided.

[kassane]

Current:

sokol-d/src/sokol/gfx.d

Lines 11 to 25 in 6f0b30e

	// WIP: helper function to convert "anything" to a Range struct
	Range asRange(T)(T val) @trusted {
	import std.traits;
	static if (isPointer!T) {
	return Range(val, T.sizeof);
	} else static if (is(T == float[]) || is(T == double[])) {
	auto arr = val.dup;
	return Range(&arr[0], arr.length * arr[0].sizeof);
	} else static if (is(T == struct)) {
	Range r = {ptr: cast(const(void)*)&val, size: T.sizeof};
	return r;
	} else {
	static assert(0, "Cannot convert to range");
	}
	}

Why not @safe?

/home/kassane/sokol-d/src/sokol/gfx.d(21,15): Error: scope variable `r` may not be returned
       return r;
              ^
/home/kassane/sokol-d/src/examples/cube.d(116,28): Error: template instance `sokol.gfx.asRange!(VsParams)` error instantiating
    sg.Range r = sg.asRange(vsParams);
                           ^
ldc2: error: the following command exited with error code 1:

[kassane]

moved to sokol.utils: c088de5

Still considering the necessity for this cast or simply discarding it. Though it won't be applied or auto-generated anymore.

[kassane]

removed: 9198de3#diff-04d720d5f77fc4452ef6cad7ff3a60b2a36a82f4867b4a453101c3877bd38303