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Niels Lohmann
7cb4d3284e
A plain (void) cast on a call expression suppresses the C++17 [[nodiscard]] warning but not GCC's warning for functions annotated via the GNU __attribute__((warn_unused_result)) form -- which is what JSON_HEDLEY_WARN_UNUSED_RESULT expands to on GCC. Several existing tests that call a newly-annotated function (dump(), empty()) purely to check that it throws/does not throw, discarding the result via (void), newly warned (and failed -Werror builds) once the annotation was broadened. Route those discards through a small ignore_return_value() helper instead, which actually consumes the value and suppresses the warning on both attribute forms. Signed-off-by: Niels Lohmann <mail@nlohmann.me>