<format>
: Make non-Standard constructors of basic_format_arg::handle
and basic_format_context
private
#4489
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Notes:
handle
's constructor is exposition only and private in the standard wording ([format.arg]/10), so at least the constructor shouldn't be callable from user code. Removingstatic_assert
messages due to this.The standard wording seemingly leaves special member functions ofbasic_format_context
implicitly declared ([format.context]), which means that its default constructor should be declared and defaulted.basic_format_context
are changed to take references to avoid double copy/move.basic_format_arg
,handle
, andbasic_format_context
are consistently performed by_Make_from
static member functions, and_Make_from
functions are consistently marked_NODISCARD
.