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#include <catch2/catch.hpp>
#include <tl/optional.hpp>
#include <type_traits>
struct foo{
int& v() { return i; }
int i = 0;
};
int& x(int& i) { i = 42; return i;}
TEST_CASE("issue 14") {
tl::optional<foo> f = foo{};
auto v = f.map(&foo::v).map(x);
static_assert(std::is_same<decltype(v), tl::optional<int&>>::value, "Must return a reference");
REQUIRE(f->i == 42);
REQUIRE(*v == 42);
REQUIRE((&f->i) == (&*v));
}
struct fail_on_copy_self {
int value;
fail_on_copy_self(int v) : value(v) {}
fail_on_copy_self(const fail_on_copy_self& other) : value(other.value) {
REQUIRE(&other != this);
}
};
TEST_CASE("issue 15") {
tl::optional<fail_on_copy_self> o = fail_on_copy_self(42);
o = o;
REQUIRE(o->value == 42);
}
TEST_CASE("issue 33") {
int i = 0;
int j = 0;
tl::optional<int&> a = i;
a.emplace(j);
*a = 42;
REQUIRE(j == 42);
REQUIRE(*a == 42);
REQUIRE(a.has_value());
}
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