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Constructor.
template<
class Formattable
>
formattable_ref(
Formattable&& value);
Constructs a type-erased formattable reference from a concrete Formattable
type.
This constructor participates in overload resolution only if the passed
value meets the Formattable
concept and is not a formattable_ref
or a reference to one.
No-throw guarantee.
value is potentially stored as a view, although some cheap-to-copy types may be stored as values.