[string.op+=] - C++14 → C++17

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+##### `basic_string::operator+=` <a id="string.op+=">[[string.op+=]]</a>
+``` cpp
+basic_string&
+  operator+=(const basic_string& str);
+```
+*Effects:* Calls `append(str)`.
+*Returns:* `*this`.
+``` cpp
+basic_string& operator+=(basic_string_view<charT, traits> sv);
+```
+*Effects:* Calls `append(sv)`.
+*Returns:* `*this`.
+``` cpp
+basic_string& operator+=(const charT* s);
+```
+*Effects:* Calls `append(s)`.
+*Returns:* `*this`.
+``` cpp
+basic_string& operator+=(charT c);
+```
+*Effects:* Calls `push_back(c)`;
+*Returns:* `*this`.
+``` cpp
+basic_string& operator+=(initializer_list<charT> il);
+```
+*Effects:* Calls `append(il)`.
+*Returns:* `*this`.

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