ScopeSwapOStream.hpp

#include <iostream>

class ScopeSwapOStream
{
public:
    ScopeSwapOStream(const ScopeSwapOStream&&)            = delete;
    ScopeSwapOStream(const ScopeSwapOStream&)             = delete;
    ScopeSwapOStream& operator=(const ScopeSwapOStream&&) = delete;
    ScopeSwapOStream& operator=(const ScopeSwapOStream&)  = delete;

        ScopeSwapOStream
            ( std::ostream & original
            , std::ostream & swap)
                : _original(original)
                , _originalBuf(_original.rdbuf(swap.rdbuf()))
    {
    }

    ~ScopeSwapOStream()
    {
        _original.rdbuf(_originalBuf);
    }

private:

    std::ostream   & _original;
    std::streambuf * _originalBuf;
};