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T.61 example fixes (#1813)

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@ -18034,14 +18034,14 @@ This limits use and typically increases code size.
##### Example, bad ##### Example, bad
template<typename T, typename A = std::allocator{}> template<typename T, typename A = std::allocator<T>>
// requires Regular<T> && Allocator<A> // requires Regular<T> && Allocator<A>
class List { class List {
public: public:
struct Link { // does not depend on A struct Link { // does not depend on A
T elem; T elem;
T* pre; Link* pre;
T* suc; Link* suc;
}; };
using iterator = Link*; using iterator = Link*;
@ -18062,11 +18062,11 @@ Typically, the solution is to make what would have been a nested class non-local
template<typename T> template<typename T>
struct Link { struct Link {
T elem; T elem;
T* pre; Link* pre;
T* suc; Link* suc;
}; };
template<typename T, typename A = std::allocator{}> template<typename T, typename A = std::allocator<T>>
// requires Regular<T> && Allocator<A> // requires Regular<T> && Allocator<A>
class List2 { class List2 {
public: public:
@ -18076,11 +18076,11 @@ Typically, the solution is to make what would have been a nested class non-local
// ... // ...
private: private:
Link* head; Link<T>* head;
}; };
List<int> lst1; List2<int> lst1;
List<int, My_allocator> lst2; List2<int, My_allocator> lst2;
Some people found the idea that the `Link` no longer was hidden inside the list scary, so we named the technique Some people found the idea that the `Link` no longer was hidden inside the list scary, so we named the technique
[SCARY](http://www.open-std.org/jtc1/sc22/WG21/docs/papers/2009/n2911.pdf). From that academic paper: [SCARY](http://www.open-std.org/jtc1/sc22/WG21/docs/papers/2009/n2911.pdf). From that academic paper: