Snippet for #pragma once include guard

It is non-standard, but most (all?) compilers implement it.

See also https://en.wikipedia.org/wiki/Pragma_once#Portability

Author: Aster89

UltiSnips/cpp.snippets

@@ -30,6 +30,11 @@ endglobal
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+snippet ponce "#pragma once include guard"
+#pragma once
+
+endsnippet
+
 snippet main
 int main(int argc, char *argv[])
 {