`<string>`

Defines the container class template basic_string and various supporting templates.

For more information about basic_string, see basic_string Class

Syntax

#include <string>

The C++ language and the C++ Standard Library support two types of strings:

Null-terminated character arrays often referred to as C strings.
class template objects, of type basic_string, that handle all char-like template arguments.

Type name	Description
`string`	A type that describes a specialization of the class template `basic_string` with elements of type `char` as a `string`.
`wstring`	A type that describes a specialization of the class template `basic_string` with elements of type `wchar_t` as a `wstring`.
`u16string`	A type that describes a specialization of the class template `basic_string` based on elements of type `char16_t`.
`u32string`	A type that describes a specialization of the class template `basic_string` based on elements of type `char32_t`.

Operator	Description
`operator+`	Concatenates two string objects.
`operator!=`	Tests if the string object on the left side of the operator is not equal to the string object on the right side.
`operator==`	Tests if the string object on the left side of the operator is equal to the string object on the right side.
`operator<`	Tests if the string object on the left side of the operator is less than to the string object on the right side.
`operator<=`	Tests if the string object on the left side of the operator is less than or equal to the string object on the right side.
`operator<<`	A template function that inserts a string into the output stream.
`operator>`	Tests if the string object on the left side of the operator is greater than to the string object on the right side.
`operator>=`	Tests if the string object on the left side of the operator is greater than or equal to the string object on the right side.
`operator>>`	A template function that extracts a string from the input stream.

Name	Description
`hash`	Produces a hash of a string.
`swap`	Exchanges the arrays of characters of two strings.
`stod`	Converts a character sequence to a `double`.
`stof`	Converts a character sequence to a `float`.
`stoi`	Converts a character sequence to an `int`.
`stold`	Converts a character sequence to a `long double`.
`stoll`	Converts a character sequence to a `long long`.
`stoul`	Converts a character sequence to an `unsigned long`.
`stoull`	Converts a character sequence to an `unsigned long long`.
`to_string`	Converts a value to a `string`.
`to_wstring`	Converts a value to a wide string.

Function	Description
`getline` Template	Extract a `string`, line by line, from the input stream.

Class	Description
`basic_string` Class	A class template that describes objects that can store a sequence of arbitrary character-like objects.
`char_traits` Struct	A class template that describes attributes associated with a character of type `CharType`

Name	Description
`char_traits<char>` Struct	A struct that is a specialization of the template struct `char_traits<CharType>` to an element of type `char`.
`char_traits<wchar_t>` Struct	A struct that is a specialization of the template struct `char_traits<CharType>` to an element of type `wchar_t`.
`char_traits<char16_t>` Struct	A struct that is a specialization of the template struct `char_traits<CharType>` to an element of type `char16_t`.
`char_traits<char32_t>` Struct	A struct that is a specialization of the template struct `char_traits<CharType>` to an element of type `char32_t`.

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