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Niels Lohmann
429afd4fc0
Measured on GCC 13 (x86-64) with JSON_DIAGNOSTICS or JSON_DIAGNOSTIC_POSITIONS, a recursive walk over a view took 2.7 to 2.9 times the instructions: GCC no longer inlined the walk into itself. The cause was not the walk's code but that the path and range code of errors.hpp was instantiated in every translation unit (the non-template throw helpers referenced it), which changed GCC's early inlining of unrelated view functions. diagnostics() and the throw helpers that take an error_site are now templates, so that code is instantiated only where an exception can be thrown; the walks have the instruction counts of develop again. Iterators no longer keep their container: with it, one walk was still 1.1 % slower. key() of an iterator over an array or a primitive value (invalid_iterator.207) is therefore thrown without a context, as documented. Signed-off-by: Niels Lohmann <mail@nlohmann.me>