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std::basic_string::copy(3) C++ Standard Libary std::basic_string::copy(3) NAME std::basic_string::copy - std::basic_string::copy Synopsis size_type copy( CharT* dest, size_type count, size_type pos = 0 ) (until C++20) const; constexpr size_type copy( CharT* dest, size_type count, size_type pos (since C++20) = 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 count - length of the substring pos - position of the first character to include 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 substr returns a substring (public member function) copy copies characters (C++17) (public member function of std::ba- sic_string_view<CharT,Traits>) copy copies a range of elements to a new location copy_if (function template) (C++11) memcpy copies one buffer to another (function) http://cppreference.com 2022.07.31 std::basic_string::copy(3)
NAME | Synopsis | Parameters | Return value | Exceptions | Complexity | Example | Output: | See also
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