static_assert role

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Compiling check, check condition fails, an error message is output 
format: 
The static_assert ( "Conditions", "error message");

Examples: 
The static_assert (! The sizeof (int) = 4, "the this IS Not 32bit Windows!"); 
Judging whether int length of 4, if not, then 32bit not compiler environment, fail and print an error message.