Rename Maybe to Optional

webrtc/base/optional_unittest.cc

 /*
  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include <sstream>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "webrtc/base/gunit.h"
-#include "webrtc/base/maybe.h"
+#include "webrtc/base/optional.h"
 
 namespace rtc {
 
 namespace {
 
 // Class whose instances logs various method calls (constructor, destructor,
 // etc.). Each instance has a unique ID (a simple global sequence number) and
 // an origin ID. When a copy is made, the new object gets a fresh ID but copies
 // the origin ID from the original. When a new Logger is created from scratch,
 // it gets a fresh ID, and the origin ID is the same as the ID (default
@@ skipping 83 matching lines @@
 // std::initializer_list.
 template <typename... Ts>
 std::vector<std::string> V(Ts... es) {
   std::vector<std::string> strings;
   VectorAppend(&strings, static_cast<std::string>(es)...);
   return strings;
 }
 
 }  // namespace
 
-TEST(MaybeTest, TestConstructDefault) {
+TEST(OptionalTest, TestConstructDefault) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x;
+    Optional<Logger> x;
     EXPECT_FALSE(x);
   }
   EXPECT_EQ(V("0:0. default constructor", "0:0. destructor"), *log);
 }
 
-TEST(MaybeTest, TestConstructCopyEmpty) {
+TEST(OptionalTest, TestConstructCopyEmpty) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x;
+    Optional<Logger> x;
     EXPECT_FALSE(x);
     auto y = x;
     EXPECT_FALSE(y);
   }
   EXPECT_EQ(V("0:0. default constructor", "1:0. copy constructor (from 0:0)",
               "1:0. destructor", "0:0. destructor"),
             *log);
 }
 
-TEST(MaybeTest, TestConstructCopyFull) {
+TEST(OptionalTest, TestConstructCopyFull) {
   auto log = Logger::Setup();
   {
     Logger a;
-    Maybe<Logger> x(a);
+    Optional<Logger> x(a);
     EXPECT_TRUE(x);
     log->push_back("---");
     auto y = x;
     EXPECT_TRUE(y);
     log->push_back("---");
   }
   EXPECT_EQ(V("0:0. default constructor", "1:0. copy constructor (from 0:0)",
               "---", "2:0. copy constructor (from 1:0)", "---",
               "2:0. destructor", "1:0. destructor", "0:0. destructor"),
             *log);
 }
 
-TEST(MaybeTest, TestConstructMoveEmpty) {
+TEST(OptionalTest, TestConstructMoveEmpty) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x;
+    Optional<Logger> x;
     EXPECT_FALSE(x);
-    auto y = static_cast<Maybe<Logger>&&>(x);
+    auto y = static_cast<Optional<Logger>&&>(x);
     EXPECT_FALSE(y);
   }
   EXPECT_EQ(V("0:0. default constructor", "1:0. move constructor (from 0:0)",
               "1:0. destructor", "0:0. destructor"),
             *log);
 }
 
-TEST(MaybeTest, TestConstructMoveFull) {
+TEST(OptionalTest, TestConstructMoveFull) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x(Logger(17));
+    Optional<Logger> x(Logger(17));
     EXPECT_TRUE(x);
     log->push_back("---");
-    auto y = static_cast<Maybe<Logger>&&>(x);
+    auto y = static_cast<Optional<Logger>&&>(x);
     EXPECT_TRUE(x);
     EXPECT_TRUE(y);
     log->push_back("---");
   }
   EXPECT_EQ(
       V("0:17. explicit constructor", "1:17. move constructor (from 0:17)",
         "0:17. destructor", "---", "2:17. move constructor (from 1:17)", "---",
         "2:17. destructor", "1:17. destructor"),
       *log);
 }
 
-TEST(MaybeTest, TestCopyAssignToEmptyFromEmpty) {
+TEST(OptionalTest, TestCopyAssignToEmptyFromEmpty) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x, y;
+    Optional<Logger> x, y;
     x = y;
   }
   EXPECT_EQ(
       V("0:0. default constructor", "1:1. default constructor",
         "0:1. operator= copy (from 1:1)", "1:1. destructor", "0:1. destructor"),
       *log);
 }
 
-TEST(MaybeTest, TestCopyAssignToFullFromEmpty) {
+TEST(OptionalTest, TestCopyAssignToFullFromEmpty) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x(Logger(17));
-    Maybe<Logger> y;
+    Optional<Logger> x(Logger(17));
+    Optional<Logger> y;
     log->push_back("---");
     x = y;
     log->push_back("---");
   }
   EXPECT_EQ(
       V("0:17. explicit constructor", "1:17. move constructor (from 0:17)",
         "0:17. destructor", "2:2. default constructor", "---",
         "1:2. operator= copy (from 2:2)", "---", "2:2. destructor",
         "1:2. destructor"),
       *log);
 }
 
-TEST(MaybeTest, TestCopyAssignToEmptyFromFull) {
+TEST(OptionalTest, TestCopyAssignToEmptyFromFull) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x;
-    Maybe<Logger> y(Logger(17));
+    Optional<Logger> x;
+    Optional<Logger> y(Logger(17));
     log->push_back("---");
     x = y;
     log->push_back("---");
   }
   EXPECT_EQ(V("0:0. default constructor", "1:17. explicit constructor",
               "2:17. move constructor (from 1:17)", "1:17. destructor", "---",
               "0:17. operator= copy (from 2:17)", "---", "2:17. destructor",
               "0:17. destructor"),
             *log);
 }
 
-TEST(MaybeTest, TestCopyAssignToFullFromFull) {
+TEST(OptionalTest, TestCopyAssignToFullFromFull) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x(Logger(17));
-    Maybe<Logger> y(Logger(42));
+    Optional<Logger> x(Logger(17));
+    Optional<Logger> y(Logger(42));
     log->push_back("---");
     x = y;
     log->push_back("---");
   }
   EXPECT_EQ(
       V("0:17. explicit constructor", "1:17. move constructor (from 0:17)",
         "0:17. destructor", "2:42. explicit constructor",
         "3:42. move constructor (from 2:42)", "2:42. destructor", "---",
         "1:42. operator= copy (from 3:42)", "---", "3:42. destructor",
         "1:42. destructor"),
       *log);
 }
 
-TEST(MaybeTest, TestCopyAssignToEmptyFromT) {
+TEST(OptionalTest, TestCopyAssignToEmptyFromT) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x;
+    Optional<Logger> x;
     Logger y(17);
     log->push_back("---");
-    x = rtc::Maybe<Logger>(y);
+    x = Optional<Logger>(y);
     log->push_back("---");
   }
   EXPECT_EQ(V("0:0. default constructor", "1:17. explicit constructor", "---",
               "2:17. copy constructor (from 1:17)",
               "0:17. operator= move (from 2:17)", "2:17. destructor", "---",
               "1:17. destructor", "0:17. destructor"),
             *log);
 }
 
-TEST(MaybeTest, TestCopyAssignToFullFromT) {
+TEST(OptionalTest, TestCopyAssignToFullFromT) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x(Logger(17));
+    Optional<Logger> x(Logger(17));
     Logger y(42);
     log->push_back("---");
-    x = rtc::Maybe<Logger>(y);
+    x = Optional<Logger>(y);
     log->push_back("---");
   }
   EXPECT_EQ(
       V("0:17. explicit constructor", "1:17. move constructor (from 0:17)",
         "0:17. destructor", "2:42. explicit constructor", "---",
         "3:42. copy constructor (from 2:42)",
         "1:42. operator= move (from 3:42)", "3:42. destructor", "---",
         "2:42. destructor", "1:42. destructor"),
       *log);
 }
 
-TEST(MaybeTest, TestMoveAssignToEmptyFromEmpty) {
+TEST(OptionalTest, TestMoveAssignToEmptyFromEmpty) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x, y;
-    x = static_cast<Maybe<Logger>&&>(y);
+    Optional<Logger> x, y;
+    x = static_cast<Optional<Logger>&&>(y);
   }
   EXPECT_EQ(
       V("0:0. default constructor", "1:1. default constructor",
         "0:1. operator= move (from 1:1)", "1:1. destructor", "0:1. destructor"),
       *log);
 }
 
-TEST(MaybeTest, TestMoveAssignToFullFromEmpty) {
+TEST(OptionalTest, TestMoveAssignToFullFromEmpty) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x(Logger(17));
-    Maybe<Logger> y;
+    Optional<Logger> x(Logger(17));
+    Optional<Logger> y;
     log->push_back("---");
-    x = static_cast<Maybe<Logger>&&>(y);
+    x = static_cast<Optional<Logger>&&>(y);
     log->push_back("---");
   }
   EXPECT_EQ(
       V("0:17. explicit constructor", "1:17. move constructor (from 0:17)",
         "0:17. destructor", "2:2. default constructor", "---",
         "1:2. operator= move (from 2:2)", "---", "2:2. destructor",
         "1:2. destructor"),
       *log);
 }
 
-TEST(MaybeTest, TestMoveAssignToEmptyFromFull) {
+TEST(OptionalTest, TestMoveAssignToEmptyFromFull) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x;
-    Maybe<Logger> y(Logger(17));
+    Optional<Logger> x;
+    Optional<Logger> y(Logger(17));
     log->push_back("---");
-    x = static_cast<Maybe<Logger>&&>(y);
+    x = static_cast<Optional<Logger>&&>(y);
     log->push_back("---");
   }
   EXPECT_EQ(V("0:0. default constructor", "1:17. explicit constructor",
               "2:17. move constructor (from 1:17)", "1:17. destructor", "---",
               "0:17. operator= move (from 2:17)", "---", "2:17. destructor",
               "0:17. destructor"),
             *log);
 }
 
-TEST(MaybeTest, TestMoveAssignToFullFromFull) {
+TEST(OptionalTest, TestMoveAssignToFullFromFull) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x(Logger(17));
-    Maybe<Logger> y(Logger(42));
+    Optional<Logger> x(Logger(17));
+    Optional<Logger> y(Logger(42));
     log->push_back("---");
-    x = static_cast<Maybe<Logger>&&>(y);
+    x = static_cast<Optional<Logger>&&>(y);
     log->push_back("---");
   }
   EXPECT_EQ(
       V("0:17. explicit constructor", "1:17. move constructor (from 0:17)",
         "0:17. destructor", "2:42. explicit constructor",
         "3:42. move constructor (from 2:42)", "2:42. destructor", "---",
         "1:42. operator= move (from 3:42)", "---", "3:42. destructor",
         "1:42. destructor"),
       *log);
 }
 
-TEST(MaybeTest, TestMoveAssignToEmptyFromT) {
+TEST(OptionalTest, TestMoveAssignToEmptyFromT) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x;
+    Optional<Logger> x;
     Logger y(17);
     log->push_back("---");
-    x = rtc::Maybe<Logger>(static_cast<Logger&&>(y));
+    x = Optional<Logger>(static_cast<Logger&&>(y));
     log->push_back("---");
   }
   EXPECT_EQ(V("0:0. default constructor", "1:17. explicit constructor", "---",
               "2:17. move constructor (from 1:17)",
               "0:17. operator= move (from 2:17)", "2:17. destructor", "---",
               "1:17. destructor", "0:17. destructor"),
             *log);
 }
 
-TEST(MaybeTest, TestMoveAssignToFullFromT) {
+TEST(OptionalTest, TestMoveAssignToFullFromT) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x(Logger(17));
+    Optional<Logger> x(Logger(17));
     Logger y(42);
     log->push_back("---");
-    x = rtc::Maybe<Logger>(static_cast<Logger&&>(y));
+    x = Optional<Logger>(static_cast<Logger&&>(y));
     log->push_back("---");
   }
   EXPECT_EQ(
       V("0:17. explicit constructor", "1:17. move constructor (from 0:17)",
         "0:17. destructor", "2:42. explicit constructor", "---",
         "3:42. move constructor (from 2:42)",
         "1:42. operator= move (from 3:42)", "3:42. destructor", "---",
         "2:42. destructor", "1:42. destructor"),
       *log);
 }
 
-TEST(MaybeTest, TestDereference) {
+TEST(OptionalTest, TestDereference) {
   auto log = Logger::Setup();
   {
-    Maybe<Logger> x(Logger(42));
+    Optional<Logger> x(Logger(42));
     const auto& y = x;
     log->push_back("---");
     x->Foo();
     y->Foo();
-    static_cast<Maybe<Logger>&&>(x)->Foo();
-    static_cast<const Maybe<Logger>&&>(y)->Foo();
+    static_cast<Optional<Logger>&&>(x)->Foo();
+    static_cast<const Optional<Logger>&&>(y)->Foo();
     log->push_back("---");
     (*x).Foo();
     (*y).Foo();
-    (*static_cast<Maybe<Logger>&&>(x)).Foo();
-    (*static_cast<const Maybe<Logger>&&>(y)).Foo();
+    (*static_cast<Optional<Logger>&&>(x)).Foo();
+    (*static_cast<const Optional<Logger>&&>(y)).Foo();
     log->push_back("---");
   }
   EXPECT_EQ(V("0:42. explicit constructor",
               "1:42. move constructor (from 0:42)", "0:42. destructor", "---",
               "1:42. Foo()", "1:42. Foo() const", "1:42. Foo()",
               "1:42. Foo() const", "---", "1:42. Foo()", "1:42. Foo() const",
               "1:42. Foo()", "1:42. Foo() const", "---", "1:42. destructor"),
             *log);
 }
 
-TEST(MaybeTest, TestDereferenceWithDefault) {
+TEST(OptionalTest, TestDereferenceWithDefault) {
   auto log = Logger::Setup();
   {
     const Logger a(17), b(42);
-    Maybe<Logger> x(a);
-    Maybe<Logger> y;
+    Optional<Logger> x(a);
+    Optional<Logger> y;
     log->push_back("-1-");
     EXPECT_EQ(a, x.value_or(Logger(42)));
     log->push_back("-2-");
     EXPECT_EQ(b, y.value_or(Logger(42)));
     log->push_back("-3-");
-    EXPECT_EQ(a, Maybe<Logger>(Logger(17)).value_or(b));
+    EXPECT_EQ(a, Optional<Logger>(Logger(17)).value_or(b));
     log->push_back("-4-");
-    EXPECT_EQ(b, Maybe<Logger>().value_or(b));
+    EXPECT_EQ(b, Optional<Logger>().value_or(b));
     log->push_back("-5-");
   }
   EXPECT_EQ(
       V("0:17. explicit constructor", "1:42. explicit constructor",
         "2:17. copy constructor (from 0:17)", "3:3. default constructor", "-1-",
         "4:42. explicit constructor", "operator== 0:17, 2:17",
         "4:42. destructor", "-2-", "5:42. explicit constructor",
         "operator== 1:42, 5:42", "5:42. destructor", "-3-",
         "6:17. explicit constructor", "7:17. move constructor (from 6:17)",
         "operator== 0:17, 7:17", "7:17. destructor", "6:17. destructor", "-4-",
         "8:8. default constructor", "operator== 1:42, 1:42", "8:8. destructor",
         "-5-", "3:3. destructor", "2:17. destructor", "1:42. destructor",
         "0:17. destructor"),
       *log);
 }
 
-TEST(MaybeTest, TestEquality) {
+TEST(OptionalTest, TestEquality) {
   auto log = Logger::Setup();
   {
     Logger a(17), b(42);
-    Maybe<Logger> ma1(a), ma2(a), mb(b), me1, me2;
+    Optional<Logger> ma1(a), ma2(a), mb(b), me1, me2;
     log->push_back("---");
     EXPECT_EQ(ma1, ma1);
     EXPECT_EQ(ma1, ma2);
     EXPECT_NE(ma1, mb);
     EXPECT_NE(ma1, me1);
     EXPECT_EQ(me1, me1);
     EXPECT_EQ(me1, me2);
     log->push_back("---");
   }
   EXPECT_EQ(V("0:17. explicit constructor", "1:42. explicit constructor",
               "2:17. copy constructor (from 0:17)",
               "3:17. copy constructor (from 0:17)",
               "4:42. copy constructor (from 1:42)", "5:5. default constructor",
               "6:6. default constructor", "---", "operator== 2:17, 2:17",
               "operator== 2:17, 3:17", "operator!= 2:17, 4:42", "---",
               "6:6. destructor", "5:5. destructor", "4:42. destructor",
               "3:17. destructor", "2:17. destructor", "1:42. destructor",
               "0:17. destructor"),
             *log);
 }
 
-TEST(MaybeTest, TestSwap) {
+TEST(OptionalTest, TestSwap) {
   auto log = Logger::Setup();
   {
     Logger a(17), b(42);
-    Maybe<Logger> x1(a), x2(b), y1(a), y2, z1, z2;
+    Optional<Logger> x1(a), x2(b), y1(a), y2, z1, z2;
     log->push_back("---");
     swap(x1, x2);  // Swap full <-> full.
     swap(y1, y2);  // Swap full <-> empty.
     swap(z1, z2);  // Swap empty <-> empty.
     log->push_back("---");
   }
   EXPECT_EQ(V("0:17. explicit constructor", "1:42. explicit constructor",
               "2:17. copy constructor (from 0:17)",
               "3:42. copy constructor (from 1:42)",
               "4:17. copy constructor (from 0:17)", "5:5. default constructor",
               "6:6. default constructor", "7:7. default constructor", "---",
               "swap 2:42, 3:17", "swap 4:5, 5:17", "swap 6:7, 7:6", "---",
               "7:6. destructor", "6:7. destructor", "5:17. destructor",
               "4:5. destructor", "3:17. destructor", "2:42. destructor",
               "1:42. destructor", "0:17. destructor"),
             *log);
 }
 
 }  // namespace rtc