nullstream.h

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#pragma once
 
#include <streambuf>
#include <ostream>
#include <istream>
 
namespace bs {
    template<typename char_t, typename traits_t>
    class basic_nullbuffer : public virtual std::basic_streambuf<char_t, traits_t> {
    public:
        using char_type = std::basic_istream<char_t, traits_t>::char_type;
        using traits_type = std::basic_istream<char_t, traits_t>::traits_type;
        using int_type = std::basic_istream<char_t, traits_t>::int_type;
 
    public:
        std::streamsize xsgetn(char_t *s, std::streamsize n) override {
            (void) s;
            (void) n;
            return 0;
        }
 
        std::streamsize xsputn(const char_t *s, std::streamsize n) override {
            (void) s;
            (void) n;
            return 0;
        }
    };
 
    template<typename char_t, typename traits_t>
    class basic_iinullstream : public virtual std::basic_istream<char_t, traits_t> {
    public:
        using char_type = std::basic_istream<char_t, traits_t>::char_type;
        using traits_type = std::basic_istream<char_t, traits_t>::traits_type;
        using int_type = std::basic_istream<char_t, traits_t>::int_type;
        using pos_type = std::basic_istream<char_t, traits_t>::pos_type;
        using off_type = std::basic_istream<char_t, traits_t>::off_type;
 
    public:
        basic_iinullstream()
            : std::basic_istream<char_t, traits_t>(&m_oNullBuffer) {
        }
 
    private:
        basic_nullbuffer<char_t, traits_t> m_oNullBuffer; 
    };
 
    template<typename char_t, typename traits_t>
    class basic_onullstream : public virtual std::basic_ostream<char_t, traits_t> {
    public:
        using char_type = std::basic_istream<char_t, traits_t>::char_type;
        using traits_type = std::basic_istream<char_t, traits_t>::traits_type;
        using int_type = std::basic_istream<char_t, traits_t>::int_type;
        using pos_type = std::basic_istream<char_t, traits_t>::pos_type;
        using off_type = std::basic_istream<char_t, traits_t>::off_type;
 
    public:
        basic_onullstream()
            : std::basic_ostream<char_t, traits_t>(&m_oNullBuffer) {
        }
 
    private:
        basic_nullbuffer<char_t, traits_t> m_oNullBuffer; 
    };
 
    using onullstream = basic_onullstream<char, std::char_traits<char> >;
    using u8onullstream = basic_onullstream<char8_t, std::char_traits<char8_t> >;
    using u16onullstream = basic_onullstream<char16_t, std::char_traits<char16_t> >;
    using u32onullstream = basic_onullstream<char32_t, std::char_traits<char32_t> >;
    using inullstream = basic_iinullstream<char, std::char_traits<char> >;
    using u8inullstream = basic_iinullstream<char8_t, std::char_traits<char8_t> >;
    using u16inullstream = basic_iinullstream<char16_t, std::char_traits<char16_t> >;
    using u32inullstream = basic_iinullstream<char32_t, std::char_traits<char32_t> >;
} // namespace d