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Make maybe_t conditionally copyable

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This allows it to be used with both e.g. unique_ptr and std::vector.
This commit is contained in:
ridiculousfish
2019-03-17 12:47:24 -07:00
parent 0bde698f81
commit a58662dd46
2 changed files with 145 additions and 55 deletions
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16
src/fish_tests.cpp
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@@ -5015,6 +5015,22 @@ void test_maybe() {
std::string res = acquire_test.acquire();
do_test(!acquire_test);
do_test(res == "def");
// maybe_t<T> should be copyable iff T is copyable.
using copyable = std::shared_ptr<int>;
using noncopyable = std::unique_ptr<int>;
do_test(std::is_copy_assignable<maybe_t<copyable>>::value == true);
do_test(std::is_copy_constructible<maybe_t<copyable>>::value == true);
do_test(std::is_copy_assignable<maybe_t<noncopyable>>::value == false);
do_test(std::is_copy_constructible<maybe_t<noncopyable>>::value == false);
maybe_t<std::string> c1{"abc"};
maybe_t<std::string> c2 = c1;
do_test(c1.value() == "abc");
do_test(c2.value() == "abc");
c2 = c1;
do_test(c1.value() == "abc");
do_test(c2.value() == "abc");
}
void test_layout_cache() {