gistfile1.txt

class char_stream
{
    char const* p_;
    char const* end_;

public:
    char_stream(
        char const* begin,
        char const* end)
        : p_(begin)
        , end_(end)
    {
    }

    bool
    empty() const noexcept
    {
        return p_ == end_;
    }

    char
    peek() const noexcept
    {
        if(BOOST_JSON_LIKELY(p_ < end_))
            return *p_;
        return '\0';
    }

    char
    get() const noexcept
    {
        if(BOOST_JSON_LIKELY(p_ < end_))
            return *p_++;
        return '\0';
    }
};