How to Define Template Member Functions Outside Class Definition While Accessing Both Template Parameters?

Defining Template Member Functions Outside Class Definition

Defining template member functions outside a class's definition while allowing access to both template parameters can be achieved using a specialized syntax.

Consider the following code snippet:

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

To implement the bar member function outside the class definition, use this syntax:

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

In this syntax:

1. The first template statement declares the outer template parameter T.
2. The second template statement declares the inner template parameter U.
3. Foo specifies the scope of the member function bar to the template class Foo with template parameter T.
4. The nested angle brackets <> indicate that bar is a template member function with parameter U.

This syntax allows you to define the member function bar outside the class definition while maintaining access to both template parameters T (of the outer class) and U (of the member function).

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