How can I define template member functions outside of a class definition in C ?

Defining Template Member Functions Outside of Class Definition

In C , it is possible to define template member functions outside of the class definition while retaining access to both template parameters. This technique can be useful for organizing code or aligning with certain coding styles.

To achieve this, you need to use a nested template declaration. The syntax is as follows:

<code class="cpp">template<class T> template <class U>
void Foo::bar() { /* implementation */ }</code>

This declaration indicates that the function bar is a member of the class Foo, and both T and U are template parameters. However, the actual implementation of the function is provided outside the class definition.

For example, consider the following code snippet:

<code class="cpp">template <class T>
class Foo
{
public:
    template <class U>
    void bar();
};

template<class T> template <class U>
void Foo::bar()
{
    // Implementation using both T and U
}</code>

Here, the function bar is implemented outside of the Foo class definition using a nested template declaration. This allows you to use both T and U within the implementation of the function, as if it were defined within the class.

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