Stream wrappers for cerr and cout

Its always convient to have a quick wrapper class at your finger tips to turn on or off all output from you system in one foul swoop. Here is a class that adds a layer of indirection to output and allows you to go into a "testing" mode where all output is suppressed

//compile with g++

#include <iostream>
#include <sstream>
#include <string>

using namespace std;

class Streams 
{
public:
static Streams& instance()
    {
        static Streams* self = NULL;
        if(self == NULL)
        {
            self = new Streams();
        }
        return *self;
    }

    static inline std::ostream& out() { return *(instance().out_); }
    static inline std::ostream& err() { return *(instance().err_); }

    void setNormal()
    {
        out_ = &std::cout;
        err_ = &std::cerr;
    }

    void setRedirected()
    {
        if(test)
        {
            delete test;
        }
        test = new std::ostringstream();
        out_ =  test;
        err_ =  test;
    }

private:
    Streams() { test = NULL; setNormal(); }
    ~Streams() { if(test) delete test; }

    std::ostream* test;
    std::ostream* out_;
    std::ostream* err_;
};

int main()
{
    Streams::out() << "bah bah bah" << endl;
    Streams::err() << "err erh ber" << endl;

    Streams::instance().setRedirected();

    Streams::out() << "bah bah bah" << endl;
    Streams::err() << "err erh ber" << endl;
}