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lang-cpp
Compareis a lambda, which is impossible to write a declaration for), I don't know of any traps.fbeforehand and then replaceComparewithf?Comparecan be a lambda function there, as inauto Compare = [](){};. But you need to usedecltype(Compare), rather thandecltype(&Compare).Seqs pq(char_range_compare);. The template arguments specify the function type (i.e. what parameters it takes and what type it returns), it doesn't specify an actual function to call. I don't know why this doesn't give a compile-time error. GCC also happily compiles your code without a warning, and produces the same seg fault. It's because there's an attempt to call a function at address 0x0000.