Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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C++ Boost

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

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;
  };

See also

Default Constructible and Assignable

Copyright © 2000 Jeremy Siek, Univ.of Notre Dame (jsiek@lsc.nd.edu)