回答編集履歴
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@@ -7,4 +7,13 @@
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};
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```
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Demo: [https://wandbox.org/permlink/KE2Y3rrXjRdKwxjA](https://wandbox.org/permlink/KE2Y3rrXjRdKwxjA)
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Demo: [https://wandbox.org/permlink/KE2Y3rrXjRdKwxjA](https://wandbox.org/permlink/KE2Y3rrXjRdKwxjA)
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---
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**追記：** 上記コードはGCCで通りますが、Clangではエラーになります。
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StackOverflowに同じトピック"[Can I implement an autonomous `self` member type in C++?](http://stackoverflow.com/questions/21143835/)"があり、どうもC++14（C++1z/17でも？）現在は実現不可能な気がしてきました。
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C++14(N3937) [expr.prim.general]/paragraph 3によれば、`this`キーワードをstaticメンバ関数の宣言中で用いるのはNGと読めます（太字部）。C++1z/17(N4659)では[expr.prim.this]/p2。
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> If a declaration declares a member function or member function template of a class `X`, the expression `this` is a prvalue of type "pointer to __cv-qualifier-seq__ `X`" [...] It shall not appear before the optional __cv-qualifier-seq__ and **it shall not appear within the declaration of a static member function** (although its type and value category are defined within a static member function as they are within a non-static member function). [...]
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