Mojo: Split off the C++ parts of mojo/public/c/system macros.h to their own file.

mojo/public/tests/system/macros_unittest.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This file consists of "positive" tests, i.e., those verifying that things
-// work (without compile errors, or even warnings if warnings are treated as
-// errors).
-// TODO(vtl): Fix no-compile tests (which are all disabled; crbug.com/105388)
-// and write some "negative" tests.
-
-#include "mojo/public/c/system/macros.h"
-
-#include <assert.h>
-#include <stdint.h>
-#include <stdlib.h>
-
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace mojo {
-namespace {
-
-TEST(MacrosTest, AllowUnused) {
-  // Test that no warning/error is issued even though |x| is unused.
-  int x MOJO_ALLOW_UNUSED = 123;
-}
-
-int MustUseReturnedResult() MOJO_WARN_UNUSED_RESULT;
-int MustUseReturnedResult() {
-  return 456;
-}
-
-TEST(MacrosTest, WarnUnusedResult) {
-  if (!MustUseReturnedResult())
-    abort();
-}
-
-// Note: MSVS is very strict (and arguably buggy) about warnings for classes
-// defined in a local scope, so define these globally.
-struct TestOverrideBaseClass {
-  virtual ~TestOverrideBaseClass() {}
-  virtual void ToBeOverridden() {}
-  virtual void AlsoToBeOverridden() = 0;
-};
-
-struct TestOverrideSubclass : public TestOverrideBaseClass {
-  virtual ~TestOverrideSubclass() {}
-  virtual void ToBeOverridden() MOJO_OVERRIDE {}
-  virtual void AlsoToBeOverridden() MOJO_OVERRIDE {}
-};
-
-TEST(MacrosTest, Override) {
-  TestOverrideSubclass x;
-  x.ToBeOverridden();
-  x.AlsoToBeOverridden();
-}
-
-// Note: MSVS is very strict (and arguably buggy) about warnings for classes
-// defined in a local scope, so define these globally.
-class TestDisallowCopyAndAssignClass {
- public:
-  TestDisallowCopyAndAssignClass() {}
-  explicit TestDisallowCopyAndAssignClass(int) {}
-  void NoOp() {}
-
- private:
-  MOJO_DISALLOW_COPY_AND_ASSIGN(TestDisallowCopyAndAssignClass);
-};
-
-TEST(MacrosTest, DisallowCopyAndAssign) {
-  TestDisallowCopyAndAssignClass x;
-  x.NoOp();
-  TestDisallowCopyAndAssignClass y(789);
-  y.NoOp();
-}
-
-// First test |MOJO_COMPILE_ASSERT()| in a global scope.
-MOJO_COMPILE_ASSERT(sizeof(int64_t) == 2 * sizeof(int32_t),
-                    bad_compile_assert_failure_in_global_scope);
-
-TEST(MacrosTest, CompileAssert) {
-  // Then in a local scope.
-  MOJO_COMPILE_ASSERT(sizeof(int32_t) == 2 * sizeof(int16_t),
-                      bad_compile_assert_failure);
-}
-
-// Test that |MOJO_ARRAYSIZE()| works in a |MOJO_COMPILE_ASSERT()|.
-const int kGlobalArray[5] = { 1, 2, 3, 4, 5 };
-MOJO_COMPILE_ASSERT(MOJO_ARRAYSIZE(kGlobalArray) == 5u,
-                    mojo_array_size_failed_in_compile_assert);
-
-TEST(MacrosTest, ArraySize) {
-  double local_array[4] = { 6.7, 7.8, 8.9, 9.0 };
-  EXPECT_EQ(4u, MOJO_ARRAYSIZE(local_array));
-}
-
-// Note: MSVS is very strict (and arguably buggy) about warnings for classes
-// defined in a local scope, so define these globally.
-class MoveOnlyInt {
-  MOJO_MOVE_ONLY_TYPE_FOR_CPP_03(MoveOnlyInt, RValue)
-
- public:
-  MoveOnlyInt() : is_set_(false), value_() {}
-  explicit MoveOnlyInt(int value) : is_set_(true), value_(value) {}
-  ~MoveOnlyInt() {}
-
-  // Move-only constructor and operator=.
-  MoveOnlyInt(RValue other) { *this = other; }
-  MoveOnlyInt& operator=(RValue other) {
-    if (other.object != this) {
-      is_set_ = other.object->is_set_;
-      value_ = other.object->value_;
-      other.object->is_set_ = false;
-    }
-    return *this;
-  }
-
-  int value() const {
-    assert(is_set());
-    return value_;
-  }
-  bool is_set() const { return is_set_; }
-
- private:
-  bool is_set_;
-  int value_;
-};
-
-TEST(MacrosTest, MoveOnlyTypeForCpp03) {
-  MoveOnlyInt x(123);
-  EXPECT_TRUE(x.is_set());
-  EXPECT_EQ(123, x.value());
-  MoveOnlyInt y;
-  EXPECT_FALSE(y.is_set());
-  y = x.Pass();
-  EXPECT_FALSE(x.is_set());
-  EXPECT_TRUE(y.is_set());
-  EXPECT_EQ(123, y.value());
-  MoveOnlyInt z(y.Pass());
-  EXPECT_FALSE(y.is_set());
-  EXPECT_TRUE(z.is_set());
-  EXPECT_EQ(123, z.value());
-  z = z.Pass();
-  EXPECT_TRUE(z.is_set());
-  EXPECT_EQ(123, z.value());
-}
-
-}  // namespace
-}  // namespace mojo