1 files changed, 128 insertions, 0 deletions
diff --git a/src/base/test/type_traits_test.cpp b/src/base/test/type_traits_test.cpp
new file mode 100644
index 0000000..b858c01
--- /dev/null
+++ b/src/base/test/type_traits_test.cpp
@@ -0,0 +1,128 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/base/type_traits.h"
+
+#include <gtest/gtest.h>
+
+#include <array>
+#include <functional>
+#include <list>
+#include <vector>
+
+namespace astc_codec {
+namespace base {
+
+TEST(TypeTraits, IsCallable) {
+  class C;
+  C* c = nullptr;
+
+  auto lambda = [c](bool) -> C* { return nullptr; };
+
+  static_assert(is_callable_as<void(), void()>::value, "simple function");
+  static_assert(is_callable_as<void (&)(), void()>::value,
+                "function reference");
+  static_assert(is_callable_as<void (*)(), void()>::value, "function pointer");
+  static_assert(is_callable_as<int(C&, C*), int(C&, C*)>::value,
+                "function with arguments and return type");
+  static_assert(is_callable_as<decltype(lambda), C*(bool)>::value, "lambda");
+  static_assert(is_callable_as<std::function<bool(int)>, bool(int)>::value,
+                "std::function");
+
+  static_assert(!is_callable_as<int, void()>::value,
+                "int should not be callable");
+  static_assert(!is_callable_as<C, void()>::value, "incomplete type");
+  static_assert(!is_callable_as<void(), void(int)>::value,
+                "different arguments");
+  static_assert(!is_callable_as<int(), void()>::value,
+                "different return types");
+  static_assert(!is_callable_as<int(), short()>::value,
+                "slightly different return types");
+  static_assert(!is_callable_as<int(int), int(int, int)>::value,
+                "more arguments");
+  static_assert(!is_callable_as<int(int, int), int(int)>::value,
+                "less arguments");
+
+  static_assert(!is_callable_as<int(int), int>::value,
+                "bad required signature");
+
+  static_assert(is_callable_with_args<void(), void()>::value,
+                "simple function");
+  static_assert(is_callable_with_args<void (&)(), void()>::value,
+                "function reference");
+  static_assert(is_callable_with_args<void (*)(), void()>::value,
+                "function pointer");
+  static_assert(is_callable_with_args<int(C&, C*), int(C&, C*)>::value,
+                "function with arguments and return type");
+  static_assert(is_callable_with_args<decltype(lambda), C*(bool)>::value,
+                "lambda");
+  static_assert(
+      is_callable_with_args<std::function<bool(int)>, bool(int)>::value,
+      "std::function");
+
+  static_assert(!is_callable_with_args<int, void()>::value,
+                "int should not be callable");
+  static_assert(!is_callable_with_args<C, void()>::value, "incomplete type");
+  static_assert(!is_callable_with_args<void(), void(int)>::value,
+                "different arguments");
+  static_assert(is_callable_with_args<int(), void()>::value,
+                "different return types are ignored");
+  static_assert(is_callable_with_args<int(), short()>::value,
+                "slightly different return types are ignored");
+  static_assert(!is_callable_with_args<int(int), int(int, int)>::value,
+                "more arguments");
+  static_assert(!is_callable_with_args<int(int, int), int(int)>::value,
+                "less arguments");
+
+  static_assert(!is_callable_with_args<int(int), int>::value,
+                "bad required signature");
+}
+
+TEST(TypeTraits, IsTemplateInstantiation) {
+  static_assert(!is_template_instantiation_of<int, std::vector>::value,
+                "int is not an instance of vector");
+  static_assert(!is_template_instantiation_of<std::list<std::vector<int>>,
+                                              std::vector>::value,
+                "list is not an instance of vector");
+
+  static_assert(
+      is_template_instantiation_of<std::vector<int>, std::vector>::value,
+      "std::vector<int> is an instance of vector");
+  static_assert(
+      is_template_instantiation_of<std::vector<std::vector<std::vector<int>>>,
+                                   std::vector>::value,
+      "nested std::vector<> is an instance of vector");
+}
+
+TEST(TypeTraits, IsRange) {
+  static_assert(is_range<std::vector<int>>::value,
+                "vector<> should be detected as a range");
+  static_assert(is_range<const std::list<std::function<void()>>>::value,
+                "const list<> should be detected as a range");
+  static_assert(is_range<std::array<std::vector<int>, 10>>::value,
+                "array<> should be detected as a range");
+  char arr[100];
+  static_assert(is_range<decltype(arr)>::value,
+                "C array should be detected as a range");
+  static_assert(is_range<decltype("string")>::value,
+                "String literal should be detected as a range");
+
+  static_assert(!is_range<int>::value, "int shouldn't be a range");
+  static_assert(!is_range<int*>::value, "int* shouldn't be a range");
+  static_assert(!is_range<const int*>::value,
+                "even const int* shouldn't be a range");
+}
+
+}  // namespace base
+}  // namespace astc_codec