[C++] data

개요

• 범위의 요소를 포함하는 메모리 블록에 대한 포인터를 반환

예제

• 코드

   #include <cstring>
   #include <iostream>
   #include <string>
   #include <string_view>
   #include <vector>
      
   using namespace std;
      
   template <typename T> constexpr string_view type_name() {
   	const string s = __PRETTY_FUNCTION__;
   	const int prefixSize = s.find("[with T = ") + strlen("[with T = ");
      
   	return string_view(s.data() + prefixSize, s.find(';') - prefixSize);
   }
      
   int main() {
   	int i[]{1, 2, 3};
   	cout << type_name<decltype(i)>() << endl;
   	cout << type_name<decltype(data(i))>() << endl;
      
   	cout << "------ 1" << endl;
      
   	string s{"abc"};
   	cout << type_name<decltype(s)>() << endl;
   	cout << type_name<decltype(data(s))>() << endl;
      
   	cout << "------ 2" << endl;
      
   	vector<int> v{1, 2, 3};
   	cout << type_name<decltype(v)>() << endl;
   	cout << type_name<decltype(data(v))>() << endl;
      
   	return 0;
   }
  

• 실행 결과

   int [3]
   int*
   ------ 1
   std::__cxx11::basic_string<char>
   char*
   ------ 2
   std::vector<int>
   int*