size_writer.h

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#pragma once
 
#include "di/types/integers.h"
#include "di/vocab/error/result.h"
namespace di::io {
class SizeWriter {
private:
    template<typename U = void>
    using Result = vocab::Result<U>;
 
public:
    auto written() const { return m_written; }
 
    constexpr auto write_some(Span<byte const> bytes) -> Result<usize> {
        m_written += bytes.size();
        return bytes.size();
    }
    constexpr static auto flush() -> Result<> { return {}; }
 
private:
    usize m_written { 0 };
};
}
 
namespace di {
using io::SizeWriter;
}