20 Strings library [strings]

20.3 String classes [string.classes]

20.3.2 Class template basic_­string [basic.string]

20.3.2.6 Modifiers [string.modifiers]

20.3.2.6.1 basic_­string​::​operator+= [string.op+=]

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basic_string& operator+=(const basic_string& str);
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Effects: Calls append(str).
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Returns: *this.
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template<class T> basic_string& operator+=(const T& t);
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Effects: Creates a variable, sv, as if by basic_­string_­view<charT, traits> sv = t; and then calls append(sv).
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Returns: *this.
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Remarks: This function shall not participate in overload resolution unless is_­convertible_­v<const T&, basic_­string_­view<charT, traits>> is true and is_­convertible_­v<const T&, const charT*> is false.
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basic_string& operator+=(const charT* s);
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Effects: Calls append(s).
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Returns: *this.
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basic_string& operator+=(charT c);
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Effects: Calls push_­back(c);
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Returns: *this.
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basic_string& operator+=(initializer_list<charT> il);
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Effects: Calls append(il).
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Returns: *this.