StreamFormatGuard.h

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#pragma once
#include "NonCopyable.h"
#include <iomanip>
 
namespace catapult { namespace utils {
 
    class StreamFormatGuard : public NonCopyable {
    public:
        StreamFormatGuard(std::ostream& out, std::ios_base::fmtflags flags, char fill)
                : m_out(out)
                , m_flags(m_out.flags(flags))
                , m_fill(m_out.fill(fill))
        {}
 
        ~StreamFormatGuard() {
            m_out.flags(m_flags);
            m_out.fill(m_fill);
        }
 
    private:
        std::ostream& m_out;
        std::ios_base::fmtflags m_flags;
        char m_fill;
    };
}}