Function main

example/should.cpp:10–20

#include <boost/ut.hpp>

int main() {
  using namespace boost::ut;

  auto i = 0;
  expect((i == 0_i) >> fatal);

  should("return increased number for ++") = [i] { expect(++mut(i) == 1_i); };
  should("return decreased number for --") = [i]() mutable {
    expect(--i == -1_i);
  };
}