C++ keyword: class

Usage

• declaration of a class

• In a template declaration , class can be used to introduce type template parameters and 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 .

Example

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;
}
enum class Pub // scoped enum, since C++11
{
    b, d, p, q
};
int main()
{
    Bar Bar(1); // variable Bar hides type Bar
    Bar Bar2(2); // compiler error
    class Bar Bar3(3); // elaborated type
}

See also

• struct , union

• enum
• typename
• template