String constructors
Syntax:
#include <string> string(); string( const string& s ); string( size_type length, const char& ch ); string( const char* str ); string( const char* str, size_type length ); string( const string& str, size_type index, size_type length ); string( input_iterator start, input_iterator end ); ~string();
The string constructors create a new string containing:
- nothing; an empty string,
- a copy of the given string s,
- length copies of ch,
- a duplicate of str (optionally up to length characters long),
- a substring of str starting at index and length characters long
- a string of characters denoted by the start and end iterators
For example,
string str1( 5, 'c' ); string str2( "Now is the time..." ); string str3( str2, 11, 4 ); cout << str1 << endl; cout << str2 << endl; cout << str3 << endl;
displays
ccccc Now is the time... time
The string constructors usually run in linear time, except the empty constructor, which runs in constant time.