std::basic_string::operator[]

1	`reference operator[]( size_type pos );`

(1)

1	`const_reference operator[]( size_type pos )` `const;`

(2)

Returns a reference to the character at specified location pos. No bounds checking is performed.

1) If pos == size(), the behavior is undefined.

2) If pos == size(), a reference to the character with value CharT() (the null character) is returned.

(until C++11)

If pos == size(), a reference to the character with value CharT() (the null character) is returned.

For the first (non-const) version, the behavior is undefined if this character is modified.

(since C++11)

Parameters

pos

position of the character to return

Return value

Reference to the requested character.

Complexity

Constant.

Example

#include <iostream>
#include <string>
  
int main()
{
  {
    std::string const c("Exemplar");
    for (unsigned i = 7;i != 0; i/=2)
        std::cout << c[i];
  }
    std::cout << '\n';
  {
    std::string s("Exemplar ");
    s[s.size()-1] = 'y';
    std::cout << s;
  }
}

Output:

rmx
Exemplary

std::basic_string::operator[]

Parameters

Return value

Complexity

Example

See also