Fighting Compiler warnings
summary
A tiny hex digit to value routine in Boost.Algorithm triggers contradictory compiler diagnostics: one compiler warns that control reaches end of nonvoid function, another warns about converting to unsigned char as a narrowing conversion. Iterating through versions (plain, templated, local variable) surfaces unreachable-code and narrowing bugs, a bad user cast suppresses warnings but masks real compiler errors, and the takeaway is to fix code or report compiler bugs rather than silencing warnings.
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