since common compilers have optimized inclusion guards http://en.wikipedia.org/wiki/Pragma_once since common compilers have optimized inclusion guards quite portable quite portable since common compilers have optimized inclusion guards #pragma once English http://en.wikipedia.org/wiki/Pragma_once #pragma once http://en.wikipedia.org/wiki/Pragma_once http://en.wikipedia.org/wiki/Pragma_once since common compilers have optimized inclusion guards http://en.wikipedia.org/wiki/Pragma_once Pragma once #Pragma once #pragma once #pragma once #pragma once quite portable http://en.wikipedia.org/wiki/Pragma_once http://en.wikipedia.org/wiki/Pragma_once since common compilers have optimized inclusion guards #pragma once quite portable quite portable several compilers http://en.wikipedia.org/wiki/Pragma_once English #pragma once English http://en.wikipedia.org/wiki/Pragma_once #Pragma once English since common compilers have optimized inclusion guards #Pragma once http://en.wikipedia.org/wiki/Pragma_once English English widely supported #Pragma once quite portable quite portable since common compilers have optimized inclusion guards http://en.wikipedia.org/wiki/Pragma_once quite portable #pragma once #pragma once since common compilers have optimized inclusion guards #pragma once quite portable #once since common compilers have optimized inclusion guards en.wikipedia.org/wiki/Pragma_once English #Pragma once http://en.wikipedia.org/wiki/Pragma_once http://en.wikipedia.org/wiki/Pragma_once #pragma once http://en.wikipedia.org/wiki/Pragma_once widely #pragma once English #Pragma once en.wikipedia.org/wiki/Pragma_once #pragma once http://en.wikipedia.org/wiki/Pragma_once http://en.wikipedia.org/wiki/Pragma_once English Pragma once https://en.wikipedia.org/wiki/Pragma_once #Pragma once http://en.wikipedia.org/wiki/Pragma_once #pragma once English quite portable English since common compilers have optimized inclusion guards #pragma once pragma once en.wikipedia.org/wiki/Pragma_once