CODEWITHSUNDEEP
c++
Dlean Jeans
Dlean Jeans

Reputation: 996

Convert implicitly float to other type

For example, I have a class called Length.

class Length {
public:
    static const float METER_TO_FLOAT_RATIO;

    Length();
    void setValue(float valueInMeter);
    operator const float();

private:
    float valueInMeter_;
};

const float METER_TO_FLOAT_RATIO= 10;

Length::Length() {}

Length::operator const float() {
    return this->valueInMeter_ * METER_TO_FLOAT_RATIO;
}

void drawRectangle(Length width, Length height) {
    //draw width * height rectangle
}

int main() {

    Length width, height;

    width = 20.0f;
    height = 10.0f;

    drawRectangle(width, height);

    return 0;
}

I asked this question to figure it out how to convert implicitly from Length to float but I forgot to or didn't ask about how to convert backward. The method which converts backward will call this statement:

    valueInMeter_ = valueInFloat_ / METER_TO_FLOAT_RATIO; //valueInFloat_ is the parameter

Upvotes: 0

Views: 48

Answers (1)

R Sahu
R Sahu

Reputation: 206567

There are two ways that I can think of:

  1. Use a converting constructor.

    Length(float val);

  2. Use an overloaded assignment operator.

    Length& operator=(float val);

If you add the converting constructor, you won't need the assignment operator.

Upvotes: 3

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