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Saturday, January 28, 2017

C++ Library -

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

S.N. Member function & description
1 (constructor) It constructs string object.
2 (destructor) It is a string destructor.
3 operator= It is a string assignment.

Iterators

S.N. 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

S.N. 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

S.N. 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

S.N. 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

S.N. 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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