format_context.h

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#pragma once
 
#include "di/container/string/encoding.h"
#include "di/container/string/utf8_encoding.h"
#include "di/meta/vocab.h"
 
namespace di::concepts {
template<typename T>
concept FormatContext = requires { typename meta::Encoding<T>; } && requires(T& context, char ascii_code_point) {
    { context.output(ascii_code_point) } -> SameAs<void>;
    { util::as_const(context).encoding() } -> SameAs<meta::Encoding<T>>;
};
}
 
namespace di::fmt {
struct ContextPlaceholder {
    using Encoding = container::string::Utf8Encoding;
    void output(char);
    auto encoding() const -> Encoding;
};
}
 
namespace di {
using concepts::FormatContext;
}