4.1 KiB
[meta.reflection.array]
21 Metaprogramming library [meta]
21.4 Reflection [meta.reflection]
21.4.15 Promoting to static storage arrays [meta.reflection.array]
The functions in this subclause promote compile-time storage into static storage.
template<ranges::[input_range](range.refinements#concept:input_range "25.4.6 Other range refinements [range.refinements]") R> consteval info reflect_constant_string(R&& r);
Let CharT be ranges::range_value_t.
Mandates: CharT is one ofchar,wchar_t,char8_t,char16_t,char32_t.
Let V be the pack of values of type CharT whose elements are the corresponding elements of r, except that if r refers to a string literal object, then V does not include the trailing null terminator of r.
Let P be the template parameter object ([temp.param]) of type const CharT[sizeof...(V) + 1] initialized with {V..., CharT()}.
Returns: ^^P.
[Note 1:
P is a potentially non-unique object ([intro.object]).
â end note]
template<ranges::[input_range](range.refinements#concept:input_range "25.4.6 Other range refinements [range.refinements]") R> consteval info reflect_constant_array(R&& r);
Let T be ranges::range_value_t.
Mandates: T is a structural type ([temp.param]),is_constructible_v<T, ranges::range_reference_t> is true, andis_copy_constructible_v is true.
Let V be the pack of values of type info of the same size as r, where the ith element is reflect_constant(ei), where ei is the ith element of r.
Let P be
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If sizeof...(V) > 0 is true, then the template parameter object ([temp.param]) of type const T[sizeof...(V)] initialized with {[:V:]...}.
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Otherwise, the template parameter object of type array<T, 0> initialized with {}.
Returns: ^^P.
Throws: meta::exception unlessreflect_constant(e) is a constant subexpression for every element e of r.
[Note 2:
P is a potentially non-unique object ([intro.object]).
â end note]