std::basic_string<CharT,Traits,Allocator>::copy (3) - Linux Manuals

std::basic_string<CharT,Traits,Allocator>::copy: std::basic_string<CharT,Traits,Allocator>::copy

NAME

std::basic_string<CharT,Traits,Allocator>::copy - std::basic_string<CharT,Traits,Allocator>::copy

Synopsis


size_type copy( CharT* dest,
size_type count,
size_type pos = 0) const;


Copies a substring [pos, pos+count) to character string pointed to by dest. If the requested substring lasts past the end of the string, or if count == npos, the copied substring is [pos, size()). The resulting character string is not null-terminated.
If pos > size(), std::out_of_range is thrown.

Parameters


dest - pointer to the destination character string
pos - position of the first character to include
count - length of the substring

Return value


number of characters copied

Exceptions


std::out_of_range if pos > size().

Complexity


linear in count

Example


// Run this code


  #include <string>
  #include <iostream>


  int main()
  {
    std::string foo("quuuux");
    char bar[7]{};
    foo.copy(bar, sizeof bar);
    std::cout << bar << '\n';
  }

Output:


  quuuux

See also


       returns a substring
substr (public member function)

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