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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include "opentelemetry/nostd/variant.h"
#include <string>
#include <type_traits>
#include <gtest/gtest.h>
namespace nostd = opentelemetry::nostd;
class DestroyCounter
{
public:
explicit DestroyCounter(int *count) : count_{count} {}
~DestroyCounter() { ++*count_; }
private:
int *count_;
};
TEST(VariantSizeTest, GetVariantSize)
{
EXPECT_EQ(nostd::variant_size<nostd::variant<>>::value, 0);
EXPECT_EQ(nostd::variant_size<nostd::variant<int>>::value, 1);
EXPECT_EQ((nostd::variant_size<nostd::variant<int, double>>::value), 2);
}
#if 0 // Disable this test for now. It does not compile with Visual Studio 2015.
TEST(VariantAlternativeTest, GetVariantSize)
{
EXPECT_TRUE((std::is_same<nostd::variant_alternative_t<0, nostd::variant<int>>, int>::value));
EXPECT_TRUE(
(std::is_same<nostd::variant_alternative_t<1, nostd::variant<int, double>>, double>::value));
EXPECT_TRUE((std::is_same<nostd::variant_alternative_t<1, const nostd::variant<int, double>>,
const double>::value));
}
#endif
TEST(VariantTest, Get)
{
nostd::variant<int, float> v, w;
v = 12;
EXPECT_EQ(nostd::get<int>(v), 12);
EXPECT_EQ(nostd::get<0>(v), 12);
w = v;
EXPECT_EQ(nostd::get<int>(w), 12);
EXPECT_EQ(*nostd::get_if<int>(&v), 12);
EXPECT_EQ(nostd::get_if<float>(&v), nullptr);
#if __EXCEPTIONS
EXPECT_THROW(nostd::get<float>(w), nostd::bad_variant_access);
#else
EXPECT_DEATH({ nostd::get<float>(w); }, "");
#endif
}
TEST(VariantTest, Comparison)
{
nostd::variant<int, float> v, w;
EXPECT_TRUE(v == w);
EXPECT_FALSE(v != w);
v = 3.0f;
EXPECT_TRUE(v != w);
EXPECT_FALSE(v == w);
v = 2;
w = 3;
EXPECT_TRUE(v != w);
EXPECT_FALSE(v == w);
EXPECT_TRUE(v < w);
EXPECT_FALSE(v > w);
}
TEST(VariantTest, Visit)
{
nostd::variant<int, float> v;
struct
{
int operator()(int) { return 0; }
int operator()(float) { return 1; }
} a;
EXPECT_EQ(nostd::visit(a, v), 0);
v = 2.0f;
EXPECT_EQ(nostd::visit(a, v), 1);
}
TEST(VariantTest, Destructor)
{
nostd::variant<int, DestroyCounter> v;
int destroy_count = 0;
v = DestroyCounter{&destroy_count};
destroy_count = 0;
v = 1;
EXPECT_EQ(destroy_count, 1);
{
nostd::variant<int, DestroyCounter> w;
w = DestroyCounter{&destroy_count};
destroy_count = 0;
}
EXPECT_EQ(destroy_count, 1);
}
TEST(VariantTest, Conversion)
{
nostd::variant<std::string> x("abc");
x = "def";
EXPECT_EQ(nostd::get<std::string>(x), "def");
nostd::variant<std::string, void const *> y("abc");
EXPECT_TRUE(nostd::holds_alternative<void const *>(y));
y = std::string{"xyz"};
EXPECT_TRUE(nostd::holds_alternative<std::string>(y));
}
TEST(VariantTest, Construction)
{
nostd::variant<bool, const char *, std::string> v{"abc"};
EXPECT_EQ(v.index(), 1);
}
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