Previously, missing keys would simply be left uninitialized, which was
slightly problematic. In usage, this would invoke undefined behavior and
also violated the serialization builder documentation:
If a default_value is not specified, the key is required.
This changeset also changes the error message thrown from
extraction_context::extract and extraction_context::extract_sub when
the type does not derive from std::exception to attempt to extract the
exception type from the CXXABI (if available in C++17). This uses a
different detection mechanism than demangle.cpp, which just looks for
the non-presence of _MSC_VER. This should be change in 2.0.
Previously, missing keys would simply be left uninitialized, which was slightly problematic. In usage, this would invoke undefined behavior and also violated the serialization builder documentation:
This changeset also changes the error message thrown from
extraction_context::extractandextraction_context::extract_subwhen the type does not derive fromstd::exceptionto attempt to extract the exception type from the CXXABI (if available in C++17). This uses a different detection mechanism thandemangle.cpp, which just looks for the non-presence of_MSC_VER. This should be change in 2.0.Fixes issue #124.