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谁能详细c++中string类中函数成员的用法
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basic_string Members
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*allocator_type A type that represents the allocator class for a string object.
*const_iterator A type that provides a random-access iterator that can access and read a const element in the string.
const_pointer A type that provides a pointer to a const element in a string.
*const_reference A type that provides a reference to a const element stored in a string for reading and performing const operations.
*const_reverse_iterator A type that provides a random-access iterator that can read any const element in the string.
*difference_type A type that provides the difference between two iterators that refer to elements within the same string.
iterator A type that provides a random-access iterator that can read or modify any element in a string.
*npos An unsigned integral value initialized to –1 that indicates either "not found" or "all remaining characters" when a search function fails.
*pointer A type that provides a pointer to a character element in a string or character array.
reference A type that provides a reference to an element stored in a string.
*reverse_iterator A type that provides a random-access iterator that can read or modify an element in a reversed string.
*size_type An unsigned integral type for the number of elements in a string.
*traits_type A type for the character traits of the elements stored in a string.
*value_type A type that represents the type of characters stored in a string.
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Member Functions
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+append Adds characters to the end of a string.
+assign Assigns new character values to the contents of a string.
+at Returns a reference to the element at a specified location in the string.
+basic_string Constructs a string that is empty or initialized by specific characters or that is a copy of all or part of some other string object or C-string.
+begin Returns an iterator addressing the first element in the string.
+c_str Converts the contents of a string as a C-style, null-terminated, string.
+capacity Returns the largest number of elements that could be stored in a string without increasing the memory allocation of the string.
+clear Erases all elements of a string.
+compare Compares a string with a specified string to determine if the two strings are equal or if one is lexicographically less than the other.
+copy Copies at most a specified number of characters from an indexed position in a source string to a target character array.
+data Converts the contents of a string into an array of characters.
+empty Tests whether the string is contains characters or not.
end Returns an iterator that addresses the location succeeding the last element in a string.
+erase Removes an element or a range of elements in a string from specified positions.
+find Searches a string in a forward direction for the first occurrence of a substring that matches a specified sequence of characters.
+find_first_not_of Searches through a string for the first character that is not any element of a specified string.
+find_first_of Searches through a string for the first character that matches any element of a specified string.
+find_last_not_of Searches through a string for the last character that is not any element of a specified string.
+find_last_of Searches through a string for the last character that is an element of a specified string.
+get_allocator Returns a copy of the allocator object used to construct the string.
+insert Inserts an element or a number of elements or a range of elements into the string at a specified position.
+length Returns the current number of elements in a string.
+max_size Returns the maximum number of characters a string could contain.
+push_back Adds an element to the end of the string.
rbegin Returns an iterator to the first element in a reversed string.
+rend Returns an iterator that points just beyond the last element in a reversed string.
+replace Replaces elements in a string at a specified position with specified characters or characters copied from other ranges or strings or C-strings.
+reserve Sets the capacity of the string to a number at least as great as a specified number.
+resize Specifies a new size for a string, appending or erasing elements as required.
+rfind Searches a string in a backward direction for the first occurrence of a substring that matches a specified sequence of characters.
+size Returns the current number of elements in a string.
substr Copies a substring of at most some number of characters from a string beginning from a specified position.
+swap Exchange the contents of two strings.
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Operators
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operator+= Appends characters to a string.
operator= Assigns new character values to the contents of a string.
operator[] Provides a reference to the character with a specified index in a string.
All of those above was copyed from MSDN 2003 Apr |
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发表于 2003-06-13 12:33
