string::substr C++用法
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std::string::substr
<string>
string substr (size_t pos = 0, size_t len = npos) const;
Generate substring
Returns a newly constructed string object with its value initialized to a copy of a substring of this object.The substring is the portion of the object that starts at character position pos and spans len characters.
Parameters
- pos
- Position of the first character to be copied as a substring.
If this is greater than the string length, it throws out_of_range.
Note: The first character is denoted by a value of 0 (not 1). - len
- Number of characters to include in the substring (if the string is shorter, as many characters as possible are used).
A value of string::npos indicates all characters until the end of the string.
size_t is an unsigned integral type.
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