C++: Bitmap

Show a basic storage type to handle a simple RGB raster graphics image, and some primitive associated functions.

If possible provide a function to allocate an uninitialised image, given its width and height, and provide 3 additional functions:

one to fill an image with a plain RGB color,
one to set a given pixel with a color,
one to get the color of a pixel.

#include <iostream>
#include <boost/gil/gil_all.hpp>
int main()
{
	using namespace boost::gil;
	// create 30x40 image
	rgb8_image_t img(30, 40);

	// fill with red
	rgb8_pixel_t red(255, 0, 0);
	fill_pixels(view(img), red);

	// set pixel at 10x20 to blue
	rgb8_pixel_t blue(0, 0, 255);
	view(img)(10, 20) = blue;

	// read the value of pixel at 11x20
	rgb8_pixel_t px = const_view(img)(11, 20);
	std::cout << "the pixel at 11, 20 is " << (unsigned)px[0] << ':' << (unsigned)px[1] << ':' << (unsigned)px[2]  << '\n';
}