// Copyright 2005 Google Inc.
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// ----
// Author: lar@google.com (Laramie Leavitt)
//
// These tests are really compile time tests.
// If you try to step through this in a debugger
// you will not see any evaluations, merely that
// value is assigned true or false sequentially.
#include <google/protobuf/stubs/template_util.h>
#include <google/protobuf/testing/googletest.h>
#include <gtest/gtest.h>
namespace GOOGLE_NAMESPACE = google::protobuf::internal;
namespace google {
namespace protobuf {
namespace internal {
namespace {
TEST(TemplateUtilTest, TestSize) {
EXPECT_GT(sizeof(GOOGLE_NAMESPACE::big_), sizeof(GOOGLE_NAMESPACE::small_));
}
TEST(TemplateUtilTest, TestIntegralConstants) {
// test the built-in types.
EXPECT_TRUE(true_type::value);
EXPECT_FALSE(false_type::value);
typedef integral_constant<int, 1> one_type;
EXPECT_EQ(1, one_type::value);
}
TEST(TemplateUtilTest, TestTemplateIf) {
typedef if_<true, true_type, false_type>::type if_true;
EXPECT_TRUE(if_true::value);
typedef if_<false, true_type, false_type>::type if_false;
EXPECT_FALSE(if_false::value);
}
TEST(TemplateUtilTest, TestTemplateTypeEquals) {
// Check that the TemplateTypeEquals works correctly.
bool value = false;
// Test the same type is true.
value = type_equals_<int, int>::value;
EXPECT_TRUE(value);
// Test different types are false.
value = type_equals_<float, int>::value;
EXPECT_FALSE(value);
// Test type aliasing.
typedef const int foo;
value = type_equals_<const foo, const int>::value;
EXPECT_TRUE(value);
}
TEST(TemplateUtilTest, TestTemplateAndOr) {
// Check that the TemplateTypeEquals works correctly.
bool value = false;
// Yes && Yes == true.
value = and_<true_, true_>::value;
EXPECT_TRUE(value);
// Yes && No == false.
value = and_<true_, false_>::value;
EXPECT_FALSE(value);
// No && Yes == false.
value = and_<false_, true_>::value;
EXPECT_FALSE(value);
// No && No == false.
value = and_<false_, false_>::value;
EXPECT_FALSE(value);
// Yes || Yes == true.
value = or_<true_, true_>::value;
EXPECT_TRUE(value);
// Yes || No == true.
value = or_<true_, false_>::value;
EXPECT_TRUE(value);
// No || Yes == true.
value = or_<false_, true_>::value;
EXPECT_TRUE(value);
// No || No == false.
value = or_<false_, false_>::value;
EXPECT_FALSE(value);
}
TEST(TemplateUtilTest, TestIdentity) {
EXPECT_TRUE(
(type_equals_<GOOGLE_NAMESPACE::identity_<int>::type, int>::value));
EXPECT_TRUE(
(type_equals_<GOOGLE_NAMESPACE::identity_<void>::type, void>::value));
}
} // anonymous namespace
} // namespace internal
} // namespace protobuf
} // namespace google