//

// 2.21.inline.variable.cpp

// chapter 2 language usability

// modern cpp tutorial

//

// created by changkun at changkun.de

// https://github.com/changkun/modern-cpp-tutorial

//

#include <iostream>

struct Widget {

// C++17: define and initialize a static data member inside the class

static inline int count = 0;

Widget() { ++count; }

};

// C++17: an inline variable can be safely defined in a header and

// included by multiple translation units without violating the ODR

inline int global_value = 42;

int main() {

Widget a, b, c;

std::cout << "Widget::count = " << Widget::count << std::endl; // 3

std::cout << "global_value = " << global_value << std::endl; // 42

}