c-resources/CPlusPlus20ForProgrammers-m.../examples/ch12/fig12_07/fig12_07.cpp

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// fig12_07.cpp
// Demonstrating set_new_handler.
#include <array>
#include <fmt/format.h>
#include <iostream>
#include <memory>
#include <new> // set_new_handler is defined here
// handle memory allocation failure
void customNewHandler() {
std::cerr << "customNewHandler was called\n";
std::exit(EXIT_FAILURE);
}
int main() {
std::array<std::unique_ptr<double[]>, 1000> items{};
// specify that customNewHandler should be called on
// memory allocation failure
std::set_new_handler(customNewHandler);
// aim each unique_ptr at a big block of memory
for (int i{0}; auto & item : items) {
item = std::make_unique<double[]>(500'000'000);
std::cout << fmt::format(
"items[{}] points to 500,000,000 doubles\n", i++);
}
}
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