std::basic_string::find
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< cpp | string | basic string
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size_type find( const basic_string& str, size_type pos = 0 ) const; |
(1) | |
size_type find( const CharT* s, size_type pos, size_type count ) const; |
(2) | |
size_type find( const CharT* s, size_type pos = 0 ) const; |
(3) | |
size_type find( CharT ch, size_type pos = 0 ) const; |
(4) | |
size_type find( std::basic_string_view<CharT, Traits> sv, size_type pos = 0) const; |
(5) | |
指定された文字シーケンスと一致する最初の部分文字列を検索します。検索は
pos
から始まります。つまり、発見される部分文字列はpos
より前から始まることはありません。Original:
Finds the first substring equal to the given character sequence. Search begins at pos, i.e. the found substring must not begin in a position preceding pos.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
1)
str
に等しい最初の部分文字列を検索します。Original:
Finds the first substring equal to
str
. The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
2)
s
が指す文字列の最初からcount
文字と等しい最初の部分文字列を検索します。 s
はnull文字を含めることができます。Original:
Finds the first substring equal to the first
count
characters of the character string pointed to by s
. s
can include null characters.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
3)
s
が指す文字列と等しい最初の部分文字列を検索します。文字列の長さは、最初のnull文字によって決定されます。Original:
Finds the first substring equal to the character string pointed to by
s
. The length of the string is determined by the first null character.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
4)
最初の文字
ch
を検索します。Original:
Finds the first character
ch
.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
5)
sv
に等しい最初の部分文字列を検索します。Original:
Finds the first substring equal to the string view
sv
.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
目次 |
[編集] パラメータ
str | - | 検索する文字列
Original: string to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
pos | - | 検索を開始する位置
Original: position at which to start the search The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
count | - | 検索する文字列の長さ
Original: length of substring to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
s | - | 検索する文字列へのポインタ
Original: pointer to a character string to seach for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
ch | - | 検索する文字
Original: character to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
sv | - | 検索するstd::basic_string_view
Original: std::basic_string_view to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[編集] 返り値
見つかった部分文字列の最初の文字の位置か、見つからなかった場合は
npos
を返します。Original:
Position of the first character of the found substring or npos if no such substring is found.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[編集] 例
このコードを実行します
#include <string> #include <iostream> void print(std::string::size_type n, std::string const &s) { if (n == std::string::npos) { std::cout << "not found\n"; } else { std::cout << "found: " << s.substr(n) << '\n'; } } int main() { std::string::size_type n; std::string const s = "This is a string"; // search from beginning of string n = s.find("is"); print(n, s); // search from position 5 n = s.find("is", 5); print(n, s); // find a single character n = s.find('a'); print(n, s); // find a single character n = s.find('q'); print(n, s); }
出力:
found: is is a string found: is a string found: a string not found
[編集] 参考
部分文字列が最後に現れる場所を見つける Original: find the last occurrence of a substring The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数) | |
文字が最初に現れる位置を見つける Original: find first occurrence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数) | |
文字の最初の不在を見つける Original: find first absence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数) | |
文字が最後に現れる場所を見つける Original: find last occurrence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数) | |
最後の文字が存在しないことを見つける Original: find last absence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数) |