C++ Library - <string>-alljchome-开发者的教程家园

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C++ Library - <string>

Introduction

String is a class and all objects that in string represent sequences of characters.

Following is the declaration for std::string.

typedef basic_string<char> string;

typedef basic_string<char> string;

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`

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.

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.

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.

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.

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.

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.