CopyConstructible
C++概念：CopyConstrucable
指定可以从lvalue表达式...
所需
类型T满足CopyConstructible如果。
- 类型
T满足MoveConstructible，和给予。
v，一个洛值类型表达式T或const T或者r值类型表达式const T
u，任意标识符
下列表达式必须有效并具有指定的效果。
| Expression | Post-conditions |
|---|---|
| T u = v; | The value of u is equivalent to the value of v. The value of v is unchanged. |
| 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) |
|---|
注记
直到C++11，类重载operator&不是CopyConstructible因此，%27T在标准库容器中是可用的。从C++11开始，标准库使用std::addressof每当需要对象的地址时。
另见
| is_copy_constructibleis_trivially_copy_constructibleis_nothrow_copy_constructible (C++11)(C++11)(C++11) | checks if a type has a copy constructor (class template) |
|---|
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