Reference
C Library
IOstream Library
Strings library
STL Containers
STL Algorithms
Miscellaneous

Strings library
char_traits
classes:
string
global functions:
getline
operator+
operator<<
operator>>
comparison operators
swap

operator+

function

<string>

string operator+ (const string& lhs, const string& rhs);
string operator+ (const char* lhs, const string& rhs);
string operator+ (char lhs, const string& rhs);
string operator+ (const string& lhs, const char* rhs);
string operator+ (const string& lhs, char rhs);

Add strings

Returns a string object whose contents are the combination of the content of lhs followed by those of rhs.

Because the diversity of left-hand parameter types, this function is implemented as an overload of the global operator+ function.

Parameters

lhs: A string object, a c-string or a character. Its content forms the beginning of the returned object.
rhs: If lhs is a string object, this is another string object, a c-string or a character.
If lhs is not a string object, this is a string object.
In either case, the content of rhs follows that of lhs in the returned object.

Notice that at least one of the arguments used has to be a string object.

Return value

A string object with the content of both lhs and rhs.

Example

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

// adding strings
#include <iostream>
#include <string>
using namespace std;
main ()
{
  string firstlevel ("com");
  string secondlevel ("cplusplus");
  string scheme ("http://");
  string hostname;
  string url;
  hostname = "www." + secondlevel + '.' + firstlevel;
  url = scheme + hostname;
  cout << url << endl;
  return 0;
}

Output:

http://www.cplusplus.com

Basic template declaration