std::basic_string_view::find_first_of
性病：基本[医]弦[医]意见：：查找[医]第一[医]成
| constexpr size_type find_first_of(basic_string_view v, size_type pos = 0) const; | (1) | (since C++17) |
|---|---|---|
| constexpr size_type find_first_of(CharT c, size_type pos = 0) const; | (2) | (since C++17) |
| constexpr size_type find_first_of(const CharT* s, size_type pos, size_type count) const; | (3) | (since C++17) |
| constexpr size_type find_first_of(const CharT* s, size_type pos = 0) const; | (4) | (since C++17) |
查找第一个字符，该字符等于给定字符序列中的任何字符。
1%29发现第一次出现的任何字符v在这个视图中，从位置开始pos...
2%29相当于find_first_of(basic_string_view(&c, 1), pos)...
3%29相当于find_first_of(basic_string_view(s, count), pos)...
4%29相当于find_first_of(basic_string_view(s), pos)...
参数
| v | - | view to search for |
|---|---|---|
| pos | - | position at which to start the search |
| count | - | length of the string of characters to search for |
| s | - | pointer to a string of characters to search for |
| ch | - | character to search for |
返回值
子字符串中任何字符的第一次出现的位置，或npos如果找不到这样的角色。
例外
1-2%29
noexcept规格：
noexcept
复杂性
O%28size()%2Av.size()%29最坏。
另见
| find | find characters in the view (public member function) |
|---|---|
| rfind | find the last occurrence of a substring (public member function) |
| find_last_of | find last occurrence of characters (public member function) |
| find_first_not_of | find first absence of characters (public member function) |
| find_last_not_of | find last absence of characters (public member function) |
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