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# C++ keywords: class

From cppreference.com
< cpp‎ | keyword

### [edit] Usage

- declaration of a class
- In a class template or function template, class can be used as an alternative to typename to introduce type template parameters and is required to introduce template template parameters.
- If a function or a variable exists in scope with the name identical to the name of a class type, `class` can be prepended to the name for disambiguation, resulting in an elaborated type specifier

### [edit] Example

Run this code

    class Foo;  // forward declaration of a class

    class Bar { // definition of a class
      public:
        Bar(int i) : m_i(i) {}
      private:
        int m_i;
    };

    template <class T> // template argument
    void qux() {
        T t;
    }

    int main()
    {
        Bar Bar(1);
        class Bar Bar2(2); // elaborated type
    }

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