Return a basic_format_arg type for the argument in the position specified by id, with indexing starting at zero. If id is not less than the number of contained arguments, a default‐constructed basic_format_arg object is returned.

Synopsis

Declared in <bslfmt_format_context.h>

basic_format_context<t_OUT, t_CHAR>::Arg
arg(size_t id) const noexcept;

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