C++: data

레퍼런스 · C++17

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*