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std::basic_string::find

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< cpp‎ | string‎ | basic string

 
 
ストリングスライブラリ
NULLで終わる文字列
Original:
Null-terminated strings
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バイト文字列
文字列をマルチバイト
ワイド文字列
クラス
Original:
Classes
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basic_string
char_traits
 
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
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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
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Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>
(C++11)
 
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)
指定された文字シーケンスに相当する最初の部分文字列を検索します。検索posから始まり、すなわち発見substringはpos先行する位置に始めてはいけません.
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.
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1)
strに等しい最初の部分文字列を検索し.
Original:
Finds the first substring equal to str.
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2)
countが指す文字列の最初のs文字に等しい最初の部分文字列を検索します。 sはヌル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.
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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.
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4)
最初の文字chを見つけ.
Original:
Finds the first character ch.
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目次

[編集] パラメータ

str -
検索する文字列
Original:
string to search for
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count -
を検索するための文字列の長さ
Original:
length of substring to search for
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s -
※更に用する文字列へのポインタ
Original:
pointer to a character string to seach for
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ch -
文字を検索します
Original:
character to search for
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[編集] 値を返します

そのような部分文字列が見つからなかった場合は見つかった部分文字列またはnposの最初の文字の位置.
Original:
position of the first character of the found substring or npos if no such substring is found.
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[編集]

#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);
}

Output:

found: is is a string
found: is a string
found: a string
not found

[編集] も参照してください

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
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(パブリックメンバ関数) [edit]
文字が最初に現れる位置を見つける
Original:
find first occurrence of characters
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(パブリックメンバ関数) [edit]
文字の最初の不在を見つける
Original:
find first absence of characters
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(パブリックメンバ関数) [edit]
文字が最後に現れる場所を見つける
Original:
find last occurrence of characters
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(パブリックメンバ関数) [edit]
最後の文字が存在しないことを見つける
Original:
find last absence of characters
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(パブリックメンバ関数) [edit]