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static_assert(__cplusplus >= 201707);

#include <iostream>

#include <vector>

#include <string_view>

#include <cmath>

#include <cassert>

#include <vector>

#include <iostream>

using namespace std;

/**

https://en.cppreference.com/w/cpp/ranges

https://en.cppreference.com/w/cpp/utility/source_location

https://en.cppreference.com/w/cpp/language/coroutines

*/

void init_20()

{

struct point { int x, y; };

struct line { point a, b; };

// https://en.cppreference.com/w/cpp/language/aggregate_initialization

#if __cplusplus > 201707

point p1 = { .x = { 1 }, .y{ 2 } };

point p2 { .x = { 1 }, .y{ 2 } };

#endif

#ifndef __clang__

point p4 = { x: 1, y: 2 }; // C-like gcc extension

#endif

line l1 = {};

line l2 = {1, 2};

assert(l2.a.x == 1);

assert(l2.a.y == 2);

line l3 = {1, 2, 3, 4};

assert(l3.b.x == 3);

assert(l3.b.y == 4);

}

int main()

{

init_20();

}