std::basic_string_view::copy

From cppreference.com
size_type copy( CharT* dest,

size_type count,

size_type pos = 0) const;
(since C++17)

Copies the substring [pos, pos + rcount) to the character string pointed to by dest, where rcount is the smaller of count and size() - pos.

Parameters

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

Return value

Number of characters copied

Exceptions

std::out_of_range if pos > size().

Complexity

Linear in rcount.

See also

returns a substring
(public member function)