Or, as of GCC 4.9 and Clang 3.8, just use __auto_type. It avoids duplicating the source expression, which duplicates compiler errors if the expression is erron

Or, as of GCC 4.9 and Clang 3.8, just use __auto_type. It avoids duplicating the source expression, which duplicates compiler errors if the expression is erroneous and can actually repeat side effects in the rare cases involving variable-length arrays.