Boost.Range support for ATL/WTL CString

#pragma once

#include <boost/range/begin.hpp>
#include <boost/range/empty.hpp>
#include <boost/range/size.hpp>
#include "../diagnostic/is_valid.hpp"
#include "../diagnostic/is_valid_string_buffer_range.hpp"
#include "../diagnostic/verify.hpp"

namespace tomato {

template< class BufferRange >
inline int fill_window_text(HWND hWnd, BufferRange& buf)
{
	ATLASSERT(is_valid(hWnd));
	ATLASSERT(is_valid_string_buffer_range(buf));
	ATLASSERT(!boost::empty(buf)); // api document tells nothing

	// ::GetWindowText doesn't say whether failed or has empty title.
	return ::GetWindowText(hWnd, boost::begin(buf), boost::size(buf));
}

} // namespace tomato