string_writer.h

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#pragma once
 
#include "di/container/string/mutable_string.h"
#include "di/container/string/string.h"
#include "di/container/string/utf8_encoding.h"
#include "di/meta/core.h"
#include "di/meta/vocab.h"
#include "di/util/declval.h"
#include "di/vocab/error/prelude.h"
 
namespace di::io {
template<concepts::detail::MutableString T = container::String>
requires(concepts::SameAs<meta::Encoding<T>, container::string::Utf8Encoding>)
class StringWriter {
public:
    constexpr auto write_some(vocab::Span<byte const> data)
        -> meta::LikeExpected<decltype(util::declval<T&>().push_back(c32(0))), usize> {
        for (auto byte : data) {
            m_output.push_back(c32(byte));
        }
        return data.size();
    }
 
    constexpr auto flush() -> vocab::Result<void> { return {}; }
 
    constexpr auto output() && -> T { return util::move(m_output); }
 
private:
    T m_output;
};
}
 
namespace di {
using io::StringWriter;
}