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Niels Lohmann
55670233ea
ci_test_compilers_gcc_old (4.8) and ci_test_compilers_clang (3.4) could not compile the new tuple tests. Creating a std::tuple of basic_json references, e.g. std::forward_as_tuple(j), makes these compilers instantiate basic_json's conversion operator for libstdc++'s internal tuple bases, which fails hard. This happens with and without JSON_DISABLE_TUPLE_REFERENCE_CONVERSION, so it is a limitation of these compilers, not of the new option. Tested with the CI images: clang 3.4 to 3.9 and GCC 4.8 and 4.9 fail, clang 4, 5, and 6 and GCC 5 and 6 compile all cases. Skip only the checks that create such tuples; the is_constructible checks still run. Signed-off-by: Niels Lohmann <mail@nlohmann.me>