C++ keywords: class

From cppreference.com
< cpplrm; | keyword
C++ language
General topics
Flow control
Conditional execution statements
Iteration statements (loops)
Jump statements
Functions
Function declaration
Lambda function declaration
inline specifier
Exception specifications (deprecated)
noexcept specifier (C++11)
Exceptions
Namespaces
Types
Specifiers
decltype (C++11)
auto (C++11)
alignas (C++11)
Storage duration specifiers
Initialization
Expressions
Alternative representations
Literals
Boolean - Integer - Floating-point
Character - String - nullptr (C++11)
User-defined (C++11)
Utilities
Attributes (C++11)
Types
typedef declaration
Type alias declaration (C++11)
Casts
Implicit conversions - Explicit conversions
static_cast - dynamic_cast
const_cast - reinterpret_cast
Memory allocation
Classes
Class-specific function properties
Special member functions
Templates
Miscellaneous

Usage

(since C++11)

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;
}

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