From Jason Turner

[temp.mem.class]

C++14 → C++17 1.0 KB 14 lines
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C++ Weekly: Ep 357

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  #### Member classes of class templates <a id="temp.mem.class">[[temp.mem.class]]</a>
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  A member class of a class template may be defined outside the class
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- template definition in which it is declared. The member class must be
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- defined before its first use that requires an instantiation (
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- [[temp.inst]]). For example,
 
 
 
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  ``` cpp
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  template<class T> struct A {
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  class B;
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  };
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  A<int>::B* b1; // OK: requires A to be defined but not A::B
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  template<class T> class A<T>::B { };
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  A<int>::B b2; // OK: requires A::B to be defined
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  ```
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  #### Member classes of class templates <a id="temp.mem.class">[[temp.mem.class]]</a>
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  A member class of a class template may be defined outside the class
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+ template definition in which it is declared.
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+
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+ [*Note 1*:
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+
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+ The member class must be defined before its first use that requires an
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+ instantiation ([[temp.inst]]). For example,
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  ``` cpp
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  template<class T> struct A {
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  class B;
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  };
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  A<int>::B* b1; // OK: requires A to be defined but not A::B
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  template<class T> class A<T>::B { };
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  A<int>::B b2; // OK: requires A::B to be defined
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  ```
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+ — *end note*]
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+