constant_string.h

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#pragma once
 
#include "di/container/string/encoding.h"
#include "di/meta/operations.h"
 
namespace di::concepts::detail {
template<typename T>
concept ConstantString = HasEncoding<T> && requires(T const& string) {
    { string.encoding() } -> ConvertibleTo<meta::Encoding<T>>;
    { string.span() } -> ConvertibleTo<vocab::Span<meta::EncodingCodeUnit<meta::Encoding<T>> const>>;
};
}