Using Manipulators when overloading stream operator - C++ Class

C++ examples for Class:Operator Overload

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Description

Using Manipulators when overloading stream operator

Demo Code

                                                                                                            
#include <iostream>
#include <string>
#include <fstream>
#include <map>
                                                                                                            
using namespace std;
                                                                                                            
class MicrowaveOven
{
    friend ostream &operator <<(ostream &out, MicrowaveOven &oven);
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    typedef map<ostream *, bool> FlagMap;
    int HighVoltageRadiation;
    int RadioactiveFoodCount;
    int LeakLevel;
    string OvenName;
    static FlagMap Flags;
};
                                                                                                            
MicrowaveOven::FlagMap MicrowaveOven::Flags;
ostream &operator <<(ostream &out, MicrowaveOven &oven)
{
    bool full = true;
    MicrowaveOven::FlagMap::iterator iter =
        MicrowaveOven::Flags.find(&out);
    if (iter != MicrowaveOven::Flags.end())
    {
        full = iter->second;
    }
                                                                                                            
    if (full)
    {
        out << "High Voltage Radiation: ";
        out << oven.HighVoltageRadiation << endl;
        out << "Radioactive Food Count: ";
        out << oven.RadioactiveFoodCount << endl;
        out << "Leak Level: ";
        out << oven.LeakLevel << endl;
        out << "Oven Name: ";
        out << oven.OvenName;
    }
    else
    {
        out << oven.HighVoltageRadiation << ",";
        out << oven.RadioactiveFoodCount << ",";
        out << oven.LeakLevel << ",";
        out << oven.OvenName;
    }
                                                                                                            
    return out;
}
                                                                                                            
istream &operator >(istream &in, MicrowaveOven &oven)
{
    in >> oven.HighVoltageRadiation;
    in >> oven.RadioactiveFoodCount;
    in >> oven.LeakLevel;
    in >> oven.OvenName;
    return in;
}
                                                                                                            
struct FullOvenManip {};
                                                                                                            
void FullOvenInfo(FullOvenManip x) {}
typedef void(*FullPtr)(FullOvenManip);
                                                                                                            
ostream &operator << (ostream &out, FullPtr)
{
    MicrowaveOven::Flags[&out] = true;
    return out;
}
                                                                                                            
struct MinOvenManip {};
                                                                                                            
void MinOvenInfo(MinOvenManip x) {}
typedef void(*MinPtr)(MinOvenManip);
                                                                                                            
ostream &operator << (ostream &out, MinPtr)
{
    MicrowaveOven::Flags[&out] = false;
    return out;
}
                                                                                                            
int main()
{
    MicrowaveOven myoven;
    myoven.HighVoltageRadiation = 9832;
    myoven.RadioactiveFoodCount = 7624;
    myoven.LeakLevel = 3793;
    myoven.OvenName = "Burnmaster";
                                                                                                            
    cout << myoven << endl;
    cout << FullOvenInfo << myoven << endl;
    cout << MinOvenInfo << myoven << endl;
                                                                                                            
    return 0;
}

Result


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