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If !!value is true, value is returned. Otherwise, new WindowsException(GetLastError(), msg) is thrown. WindowsException assumes that the last operation set GetLastError() appropriately.

T wenforce(T, S) (
  T value,
  lazy S msg = null,
  string file = __FILE__,
  size_t line = __LINE__
) @safe
if (isSomeString!S);


wenforce(DeleteFileA("junk.tmp"), "DeleteFile failed");


Walter Bright


Boost License 1.0.