C++ (Cpp) variant::target_type Exemples

Exemple #1

Fichier : assign.conversion.cpp Projet : dodheim/variant

    // empty target
    {
        eggs::variant<int, std::string> v;

        REQUIRE(bool(v) == false);
        REQUIRE(v.which() == npos);

        v = 42;

        CHECK(bool(v) == true);
        CHECK(v.which() == 0u);
        REQUIRE(v.target<int>() != nullptr);
        CHECK(*v.target<int>() == 42);

#if EGGS_CXX98_HAS_RTTI
        CHECK(v.target_type() == typeid(int));
#endif

#if EGGS_CXX14_HAS_CONSTEXPR
        // constexpr
        {
            struct test { static constexpr int call()
            {
                eggs::variant<int, ConstexprTrivial> v;
                v = ConstexprTrivial(42);
                return 0;
            }};
            constexpr int c = test::call();
        }
#endif
    }

Exemple #2

Fichier : cnstr.emplace.cpp Projet : egaburov/variant

#include "catch.hpp"
#include "constexpr.hpp"

using eggs::variants::in_place;

TEST_CASE("variant<Ts...>::variant(in_place<I>, Args&&...)", "[variant.cnstr]")
{
    eggs::variant<int, std::string> v(in_place<0>, 42);

    CHECK(bool(v) == true);
    CHECK(v.which() == 0u);
    REQUIRE(v.target<int>() != nullptr);
    CHECK(*v.target<int>() == 42);

#if EGGS_CXX98_HAS_RTTI
    CHECK(v.target_type() == typeid(int));
#endif

#if EGGS_CXX11_HAS_CONSTEXPR
    SECTION("constexpr")
    {
        constexpr eggs::variant<int, Constexpr> v(in_place<1>, 42);
        constexpr bool vb = bool(v);
        constexpr std::size_t vw = v.which();
        constexpr bool vttb = v.target<Constexpr>()->x == 42;

#  if EGGS_CXX98_HAS_RTTI
        constexpr std::type_info const& vtt = v.target_type();
#  endif

#  if EGGS_CXX14_HAS_CONSTEXPR