Boost C++ Libraries

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Copy Constructible

Description

A type is Copy Constructible if it is possible to copy objects of that type.

Notation

`T`	is type that is a model of Copy Constructible
`t`	is an object of type `T`
`u`	is an object of type `const T`

Definitions

Valid expressions

Name	Expression	Return type	Semantics
Copy constructor	`T(t)`	`T`	`t` is equivalent to `T(t)`
Copy constructor	T(u)	`T`	`u` is equivalent to `T(u)`
Destructor	t.~T()	`T`
Address Operator	&t	`T*`	denotes the address of `t`
Address Operator	&u	`T*`	denotes the address of `u`

Models

int
std::pair

Concept Checking Class

  template <class T>
  struct CopyConstructibleConcept
  {
    void constraints() {
      T a(b);            // require copy constructor
      T* ptr = &a;       // require address of operator
      const_constraints(a);
      ignore_unused_variable_warning(ptr);
    }
    void const_constraints(const T& a) {
      T c(a);            // require const copy constructor
      const T* ptr = &a; // require const address of operator
      ignore_unused_variable_warning(c);
      ignore_unused_variable_warning(ptr);
    }
    T b;
  };