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`std::memset` calls with a nullptr argument are flagged as UB by GCC `-fsanitize=undefined`, so check the size first Fixes boostorg#39
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std::memsetcalls with a nullptr argument are flagged as UB by GCC-fsanitize=undefined, so check the size firstSee https://godbolt.org/z/Kjch8dd1d for a simple example showing the diagnostics
Fixes #39