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#include <option.h>
#include <cstdio>
#include <cstdlib>
struct checker {
static unsigned cnt;
checker() {
++cnt;
}
checker(const checker&) {
++cnt;
}
checker(checker&&) noexcept {
++cnt;
}
~checker() {
--cnt;
}
};
unsigned checker::cnt = 0;
int main() {
using option::option;
auto check_cnt = [](unsigned expect) {
if (expect != checker::cnt) {
std::printf("Checker: expect=%u cnt=%u\n", expect, checker::cnt);
std::abort();
}
};
{
const option<int> kO1{};
const option<int> kO2{::option::none{}};
assert(!kO1.has_value());
assert(!kO2.has_value());
}
// Assume we start test with cnt=0.
check_cnt(0);
{
option<checker> o1(checker{});
// copy construct
option<checker> o2 = o1;
// move construct
option<checker> o3 = o1.take();
assert(!o1.has_value());
assert(o2.has_value());
assert(o3.has_value());
// move option
option<checker> o4 = std::move(o2);
assert(!o2.has_value());
assert(o4.has_value());
// take reference to inner
auto x = o3.value();
// take ownership of inner
auto y = o4.take();
assert(!o1.has_value());
assert(!o2.has_value());
assert(o3.has_value());
assert(!o4.has_value());
}
// Expect to finish test with cnt=0.
check_cnt(0);
{
option<checker> o1;
assert(!o1.has_value());
o1.emplace();
assert(o1.has_value());
}
// Expect to finish test with cnt=0.
check_cnt(0);
return 0;
}
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