std::string erase() method

od C++20

// (1) Non const version only
constexpr basic_string& erase( size_type index = 0, size_type count = npos );

// (2) Non const version only
constexpr iterator erase( const_iterator position );

// (3) Non const version only
constexpr iterator erase( const_iterator first, const_iterator last );

od C++11

// (1) Non const version only
basic_string& erase( size_type index = 0, size_type count = npos );

// (2) Non const version only
iterator erase( const_iterator position );

// (3) Non const version only
iterator erase( const_iterator first, const_iterator last );

do C++11

// (1) Non const version only
basic_string& erase( size_type index = 0, size_type count = npos );

// (2) Non const version only
iterator erase( iterator position );

// (3) Non const version only
iterator erase( iterator first, iterator last );

Erases specified characters from the string.

• (1) Removes std::min(count, size() - index) characters starting at index.
• (2) Removes the character at position.
• (3) Removes the characters in the range [ first, last ).

Parameters

• index - first character to remove
• count - number of characters to remove
• position - iterator to the character to remove
• first, last - range of the characters to remove

Return value

• (1) *this
• (2)
  Iterator pointing to the character immediately following the character erased.
  end() if no such character exists.
• (3)
  Iterator pointing to the character last pointed to before the erase.
  end() if no such character exists.

Complexity

important

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Exceptions

• (1) std::out_of_range if index > size().
• (2-3) (none)

In any case, if an exception is thrown for any reason, this function has no effect (strong exception guarantee).  (od C++11)

Example

Main.cpp

#include <algorithm>
#include <iostream>
#include <iterator>
#include <string>
 
int main()
{
    std::string s = "This Is An Example";
    std::cout << "1) " << s << '\n';
 
    s.erase(7, 3); // erases " An" using overload (1)
    std::cout << "2) " << s << '\n';
 
    s.erase(std::find(s.begin(), s.end(), ' ')); // erases first ' '; overload (2)
    std::cout << "3) " << s << '\n';
 
    s.erase(s.find(' ')); // trims from ' ' to the end of the string; overload (1)
    std::cout << "4) " << s << '\n';
 
    auto it = std::next(s.begin(), s.find('s')); // obtains iterator to the first 's'
    s.erase(it, std::next(it, 2)); // erases "sI"; overload (3)
    std::cout << "5) " << s << '\n';
}

Output

1) This Is An Example
2) This Is Example
3) ThisIs Example
4) ThisIs
5) This