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Introduction
String is a class and all objects that in string represent sequences of characters.
Declaration
Following is the declaration for std::string.
typedef basic_string<char> string;
C++11
typedef basic_string<char> string;
Member types
| member type | definition |
|---|---|
| value_type | char |
| traits_type | char_traits<char> |
| allocator_type | allocator<char> |
| reference | char& |
| const_reference | const char& |
| pointer | char* |
| const_pointer | const char* |
| iterator | a random access iterator to char (convertible to const_iterator) |
| const_iterator | a random access iterator to const char |
| reverse_iterator | reverse_iterator<iterator> |
| const_reverse_iterator | reverse_iterator<const_iterator> |
| difference_type | ptrdiff_t |
| size_type | size_t |
Member functions
| Sr.No. | Member function & description |
|---|---|
| 1 | (constructor)
It constructs string object. |
| 2 | (destructor)
It is a string destructor. |
| 3 | operator=
It is a string assignment. |
Iterators
| Sr.No. | Iterator & description |
|---|---|
| 1 | begin
It returns iterator to beginning. |
| 2 | end
It returns iterator to end. |
| 3 | rbegin
It returns reverse iterator to reverse beginning. |
| 4 | rend
It returns reverse iterator to reverse end. |
| 5 | cbegin
It returns const_iterator to beginning. |
| 6 | cend
It returns a const_iterator pointing to the past-the-end character of the string. |
| 7 | crbegin
It returns const_reverse_iterator to reverse beginning. |
| 8 | crend
It returns const_reverse_iterator to reverse end. |
Capacity
| Sr.No. | Capacity & description |
|---|---|
| 1 | size
It returns length of string. |
| 2 | length
It returns length of string. |
| 3 | max_size
It returns maximum size of string. |
| 4 | resize
It resizes string. |
| 5 | capacity
It returns size of allocated storage. |
| 6 | reserve
It requests a change in capacity. |
| 7 | clear
It clears the string. |
| 8 | empty
It is used to test if string is empty. |
| 9 | shrink_to_fit
It is used to shrink to fit. |
Capacity
| Sr.No. | Element acce & description |
|---|---|
| 1 | operator[]
It is used to get character of string. |
| 2 | at
It is used to get character in string. |
| 3 | back
It is used to access last character. |
| 4 | front
It is used to access first character. |
Modifiers
| Sr.No. | Modifier & description |
|---|---|
| 1 | operator+=
It appends to string. |
| 2 | append
It appends to string. |
| 3 | push_back
It appends a character to string. |
| 4 | assign
It is used to assign the content to string. |
| 5 | insert
It is used to inset the value to string. |
| 6 | erase
It is used to erase characters from string. |
| 7 | replace
It is used to replace portion of string. |
| 8 | swap
It is used to swap string values. |
| 9 | pop_back
It is used to delete last character. |
String operations
| Sr.No. | String operation & description |
|---|---|
| 1 | c_str
It is used to get C string equivalent. |
| 2 | data
It is used to get string data. |
| 3 | get_allocator
It is used to get an allocator. |
| 4 | copy
It is used to copy sequence of characters from string. |
| 5 | find
It is used to find content in string. |
| 6 | rfind
It is used to find last occurrence of content in string. |
| 7 | find_first_of
It is used to find character in string. |
| 8 | find_last_of
It is used to find character in string from the end. |
| 9 | find_first_not_of
It is used to find absence of character in string. |
| 10 | find_last_not_of
It is used to find non-matching character in string from the end. |
| 11 | substr
It is used to generate substring. |
| 12 | compare
It is used to compare strings. |
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