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#include <option.h>
#include <cstdlib>
#include <cstdio>
struct Checker {
static unsigned cnt;
Checker() {
++cnt;
}
Checker(const Checker&) {
++cnt;
}
Checker(Checker&&) {
++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();
}
};
{
option<int> o1;
option<int> o2{::option::none{}};
assert(!o1.has_value());
assert(!o2.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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