C++ named requirements: CopyConstructible

Specifies that an instance of the type can be copy-constructed from an lvalue expression.

Requirements

The type T satisfies CopyConstructible if

• The type T satisfies MoveConstructible, and

Given

• v, an lvalue expression of type T or const T or an rvalue expression of type const T
• u, an arbitrary identifier

The following expressions must be valid and have their specified effects

pub	Expression	Post-conditions
pub	T u = v;	The value of u is equivalent to the value of v. The value of v is unchanged.
pub	T(v)	The value of T(v) is equivalent to the value of v. The value of v is unchanged.

 The expression v.~T() also must be valid, and, for lvalue v, the expression &v must have the type T* or const T* and must evaluate to the address of v. (until C++11)

Notes

 
classes that overloaded operator& were not CopyConstructible and thus were not usable in the standard library containers. This is a design decision in C++98 (instead of a defect, see LWG issue 390). (until C++11)  
the standard library uses std::addressof whenever the address of an object is needed. (since C++11)