21 Strings library [strings]

21.3 String classes [string.classes]

21.3.3 Class template basic_­string [basic.string]

21.3.3.7 Modifiers [string.modifiers]

21.3.3.7.1 basic_­string​::​operator+= [string.op.append]

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constexpr basic_string& operator+=(const basic_string& str);
1
#
Effects: Equivalent to: return append(str);
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template<class T> constexpr basic_string& operator+=(const T& t);
2
#
Constraints:
  • (2.1)
    is_­convertible_­v<const T&, basic_­string_­view<charT, traits>> is true and
  • (2.2)
    is_­convertible_­v<const T&, const charT*> is false.
3
#
Effects: Equivalent to: basic_string_view<charT, traits> sv = t; return append(sv);
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constexpr basic_string& operator+=(const charT* s);
4
#
Effects: Equivalent to: return append(s);
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constexpr basic_string& operator+=(charT c);
5
#
Effects: Equivalent to: return append(size_­type{1}, c);
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constexpr basic_string& operator+=(initializer_list<charT> il);
6
#
Effects: Equivalent to: return append(il);