//

// 12.2.delete.with.reason.cpp

// chapter 12 cpp26

// modern c++ tutorial

//

// created by changkun at changkun.de

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

//

#include <iostream>

// C++26 lets a deleted function carry a reason, which the compiler

// reports if the function is selected.

void use_span(int* p, int n);

void use_span(std::nullptr_t) = delete("pass a real buffer, not nullptr");

int main() {

int buf[3] = {1, 2, 3};

use_span(buf, 3);

// use_span(nullptr); // error: call to deleted function: pass a real buffer, not nullptr

std::cout << "ok" << std::endl;

}

void use_span(int* p, int n) {

for (int i = 0; i < n; ++i) std::cout << p[i] << ' ';

std::cout << std::endl;

}