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CoffeeMug

Class template vs. method template. Difference?

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What's difference between this:
template<typename T>
class MyClass
{
public:
    void MyMethod(T t) { /* ... */ }
};
and this:
class MyClass
{
public:
    template<typename T>
    void MyMethod(T t) { /* ... */ }
};

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Here's how you'd use the first one:

MyClass< int > mc1;
mc1.MyMethod( 4 );
mc1.MyMethod( 20.0 ); //20.0 gets cast to an integer
mc1.MyMethod< double > ( 20.0 ); //ERROR: MyMethod is not a templatized thingamajig. T is defined at the variable's decleration.


Whereas here's how you'd use the second one:

MyClass mc2;
mc2.MyMethod< int >( 4 );
mc2.MyMethod< int >( 20.0 ); //20.0 gets cast to an integer
mc2.MyMethod( 20.0 ); //calls mc2.MyMethod< double >( 20.0 );

MyClass< int > mc3; //ERROR: MyClass is not a templatized thingamajig. T is defined only for MyMethod, and only as it's called.

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Ahh, so the first one creates multiple MyClass types while the second leaves me with one type but adds multiple methods to it. Gotcha, thanks!

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