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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_stringstring;
C++11
typedef basic_stringstring;
Member types
member type | definition |
---|---|
value_type | char |
traits_type | char_traits |
allocator_type | allocator |
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 |
const_reverse_iterator | reverse_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. |
Numeric Conversions
Sr.No. | Function & description |
---|---|
1 |
stoi
It is used to convert a string to an integer (int). |
2 |
stol
It is used to convert a string to a long integer. |
3 |
stoll
It is used to convert a string to a long long integer. |
4 |
stoul
It is used to convert a string to an unsigned long integer. |
5 |
stoull
It is used to convert a string to an unsigned long long integer. |
6 |
stof
It is used to convert a string to a floating point number. |
7 |
stod
It is used to convert a string to a double floating point number. |
8 |
stold
It is used to convert a string into a long double value. |