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boost::taar::handler::find_target_index_v — Find the first target_constraint leaf's index in an AST's flattened leaves.
// In header: <boost/taar/handler/path_arg_check.hpp> constexpr std::size_t find_target_index_v;
Returns static_cast<std::size_t>(-1) when no target leaf exists. Most callers don't need this directly – use find_target_template on an operand instead.