third_party/optional/tests/constexpr.cpp

#include "catch.hpp"
#include "optional.hpp"

#define TOKENPASTE(x, y) x##y
#define TOKENPASTE2(x, y) TOKENPASTE(x, y)
#define STATIC_REQUIRE(e)                                                      \
  constexpr bool TOKENPASTE2(rqure, __LINE__) = e;                             \
  REQUIRE(e);

TEST_CASE("Constexpr", "[constexpr]") {
#if !defined(TL_OPTIONAL_MSVC2015) && defined(TL_OPTIONAL_CXX14)
  SECTION("empty construct") {
    constexpr tl::optional<int> o2{};
    constexpr tl::optional<int> o3 = {};
    constexpr tl::optional<int> o4 = tl::nullopt;
    constexpr tl::optional<int> o5 = {tl::nullopt};
    constexpr tl::optional<int> o6(tl::nullopt);

    STATIC_REQUIRE(!o2);
    STATIC_REQUIRE(!o3);
    STATIC_REQUIRE(!o4);
    STATIC_REQUIRE(!o5);
    STATIC_REQUIRE(!o6);
  }

  SECTION("value construct") {
    constexpr tl::optional<int> o1 = 42;
    constexpr tl::optional<int> o2{42};
    constexpr tl::optional<int> o3(42);
    constexpr tl::optional<int> o4 = {42};
    constexpr int i = 42;
    constexpr tl::optional<int> o5 = std::move(i);
    constexpr tl::optional<int> o6{std::move(i)};
    constexpr tl::optional<int> o7(std::move(i));
    constexpr tl::optional<int> o8 = {std::move(i)};

    STATIC_REQUIRE(*o1 == 42);
    STATIC_REQUIRE(*o2 == 42);
    STATIC_REQUIRE(*o3 == 42);
    STATIC_REQUIRE(*o4 == 42);
    STATIC_REQUIRE(*o5 == 42);
    STATIC_REQUIRE(*o6 == 42);
    STATIC_REQUIRE(*o7 == 42);
    STATIC_REQUIRE(*o8 == 42);
  }
  #endif
}