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#include <vector>
#include <utility>
#include <string>
 
int main() {
	std::vector<int> v{1, 2, 3};
 
	auto iterator = v.begin();
	auto value = *iterator;
 
	static_assert(std::is_same<std::remove_const_t<decltype(value)>, int&>::value, "auto deduced as int");
 
	std::vector<std::string> v1{"abc", "bce"};
	auto iterator1 = v1.begin();
	auto string_value = *iterator1;
 
	static_assert(std::is_same<std::remove_const_t<decltype(string_value)>, std::string&>::value, "auto deduced as std::string");
 
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:11:2: error: static assertion failed: auto deduced as int
  static_assert(std::is_same<std::remove_const_t<decltype(value)>, int&>::value, "auto deduced as int");
  ^~~~~~~~~~~~~
prog.cpp:17:2: error: static assertion failed: auto deduced as std::string
  static_assert(std::is_same<std::remove_const_t<decltype(string_value)>, std::string&>::value, "auto deduced as std::string");
  ^~~~~~~~~~~~~

Standard output is empty