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std::basic_string::operator+=

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< cpp‎ | string‎ | basic string

 
 
 
std::basic_string
メンバ関数
Original:
Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
要素アクセスの循環参照を解除するために使用されている
Original:
Element access
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basic_string::at
basic_string::operator[]
basic_string::front(C++11)
basic_string::back(C++11)
basic_string::data
basic_string::c_str
イテレータ
Original:
Iterators
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basic_string::begin
basic_string::cbegin

(C++11)
basic_string::end
basic_string::cend

(C++11)
basic_string::rbegin
basic_string::crbegin

(C++11)
basic_string::rend
basic_string::crend

(C++11)
容量
Original:
Capacity
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basic_string::empty
basic_string::size
basic_string::length
basic_string::max_size
basic_string::reserve
basic_string::capacity
basic_string::shrink_to_fit(C++11)
操作
Original:
Operations
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basic_string::clear
basic_string::insert
basic_string::erase
basic_string::push_back
basic_string::pop_back(C++11)
basic_string::append
basic_string::operator+=
basic_string::compare
basic_string::replace
basic_string::substr
basic_string::copy
basic_string::resize
basic_string::swap
検索
Original:
Search
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basic_string::find
basic_string::rfind
basic_string::find_first_of
basic_string::find_first_not_of
basic_string::find_last_of
basic_string::find_last_not_of
定数
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Constants
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basic_string::npos
非メンバ関数
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Non-member functions
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operator+
operator==
operator!=
operator<
operator>
operator<=
operator>=
swap(std::basic_string)
operator<<
operator>>
getline
stoi
stol
stoll
(C++11)
(C++11)
(C++11)
stoul
stoull
(C++11)
(C++11)
stof
stod
stold
(C++11)
(C++11)
(C++11)
to_string(C++11)
to_wstring(C++11)
ヘルパークラス
Original:
Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>
(C++11)
 
basic_string& operator+=(const basic_string& str );
(1)
basic_string& operator+=( CharT ch );
(2)
basic_string& operator+=( CharT* s );
(3)
basic_string& operator+=(std::initializer_list<CharT> ilist );
(4) (C++11およびそれ以降)
basic_string& operator+=( std::basic_string_view<CharT, Traits> sv);
(5)
文字列の末尾に文字を追加します。
Original:
Appends addinional characters to the string.
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1)
文字列strを追加します。
Original:
Appends string str
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2)
文字chを追加します。
Original:
Appends character ch
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3)
NULLで終わる文字列sを追加します。
Original:
Appends the null-terminated character string pointed to by s.
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4)
initializer_listilistの文字を追加します。
Original:
Appends characters in the initializer list ilist.
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5)
append(sv)のようにstring_viewsvの文字を追加します。
Original:
Appends characters in the string view sv as if by append(sv)
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目次

[編集]パラメータ

str -
追加する文字列
Original:
string to append
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ch -
追加する文字
Original:
character value to append
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s -
追加するNULLで終わる文字列へのポインタ
Original:
pointer to a null-terminated character string to append
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ilist -
追加する文字を含むinitializer_list
Original:
initializer list with the characters to append
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sv -
追加する文字を含むbasic_string_view
Original:
std::basic_string_view with the characters to append
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[編集]戻り値

*this

[編集]複雑性

1)
strの大きさに比例
Original:
linear in size of str
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2)
定数
Original:
constant
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3)
sの大きさに比例
Original:
linear in size of s
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4)
ilistの大きさに比例
Original:
linear in size of ilist
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[編集]例外

何らかの理由で例外がスローされた場合、この関数は何の効果もありません(強い例外保証)。
Original:
If an exception is thrown for any reason, this function has no effect (strong exception guarantee).
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(C++11およびそれ以降)
操作がsize() > max_size() になる場合は、std::length_errorをスローします。
Original:
If the operation would result in size() > max_size(), throws std::length_error.
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[編集]備考

暗黙的な変換のため、operator+= は望ましくない型の値を受け入れることがあります。
Original:
Owing to Implicit conversions, operator+= might accept values of unwanted types.
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[編集]

#include <iostream>#include <iomanip>#include <string>   int main(){std::string str; str.reserve(50);//reserves sufficient storage space to avoid memory reallocationstd::cout<< std::quoted(str)<<'\n';//empty string   str +="This";std::cout<< std::quoted(str)<<'\n';   str +=std::string(" is ");std::cout<< std::quoted(str)<<'\n';   str +='a';std::cout<< std::quoted(str)<<'\n';   str +={' ','s','t','r','i','n','g','.'};std::cout<< std::quoted(str)<<'\n';   str +=76.85;// equivalent to str += static_cast<char>(76.85), might not be the intentstd::cout<< std::quoted(str)<<'\n';}

出力:

"" "This" "This is " "This is a" "This is a string." "This is a string.L"

[編集]参照

文字列に文字を割り当てます
Original:
assign characters to a string
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