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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "util/Maybe.h"
     18 
     19 #include <string>
     20 
     21 #include "test/Test.h"
     22 
     23 namespace aapt {
     24 
     25 struct Dummy {
     26   Dummy() {
     27     data = new int;
     28     *data = 1;
     29     std::cerr << "Construct Dummy{0x" << (void*)this << "} with data=0x"
     30               << (void*)data << std::endl;
     31   }
     32 
     33   Dummy(const Dummy& rhs) {
     34     data = nullptr;
     35     if (rhs.data) {
     36       data = new int;
     37       *data = *rhs.data;
     38     }
     39     std::cerr << "CopyConstruct Dummy{0x" << (void*)this << "} from Dummy{0x"
     40               << (const void*)&rhs << "}" << std::endl;
     41   }
     42 
     43   Dummy(Dummy&& rhs) {
     44     data = rhs.data;
     45     rhs.data = nullptr;
     46     std::cerr << "MoveConstruct Dummy{0x" << (void*)this << "} from Dummy{0x"
     47               << (const void*)&rhs << "}" << std::endl;
     48   }
     49 
     50   Dummy& operator=(const Dummy& rhs) {
     51     delete data;
     52     data = nullptr;
     53 
     54     if (rhs.data) {
     55       data = new int;
     56       *data = *rhs.data;
     57     }
     58     std::cerr << "CopyAssign Dummy{0x" << (void*)this << "} from Dummy{0x"
     59               << (const void*)&rhs << "}" << std::endl;
     60     return *this;
     61   }
     62 
     63   Dummy& operator=(Dummy&& rhs) {
     64     delete data;
     65     data = rhs.data;
     66     rhs.data = nullptr;
     67     std::cerr << "MoveAssign Dummy{0x" << (void*)this << "} from Dummy{0x"
     68               << (const void*)&rhs << "}" << std::endl;
     69     return *this;
     70   }
     71 
     72   ~Dummy() {
     73     std::cerr << "Destruct Dummy{0x" << (void*)this << "} with data=0x"
     74               << (void*)data << std::endl;
     75     delete data;
     76   }
     77 
     78   int* data;
     79 };
     80 
     81 TEST(MaybeTest, MakeNothing) {
     82   Maybe<int> val = make_nothing<int>();
     83   EXPECT_FALSE(val);
     84 
     85   Maybe<std::string> val2 = make_nothing<std::string>();
     86   EXPECT_FALSE(val2);
     87 
     88   val2 = make_nothing<std::string>();
     89   EXPECT_FALSE(val2);
     90 }
     91 
     92 TEST(MaybeTest, MakeSomething) {
     93   Maybe<int> val = make_value(23);
     94   ASSERT_TRUE(val);
     95   EXPECT_EQ(23, val.value());
     96 
     97   Maybe<std::string> val2 = make_value(std::string("hey"));
     98   ASSERT_TRUE(val2);
     99   EXPECT_EQ(std::string("hey"), val2.value());
    100 }
    101 
    102 TEST(MaybeTest, Lifecycle) {
    103   Maybe<Dummy> val = make_nothing<Dummy>();
    104 
    105   Maybe<Dummy> val2 = make_value(Dummy());
    106 }
    107 
    108 TEST(MaybeTest, MoveAssign) {
    109   Maybe<Dummy> val;
    110   {
    111     Maybe<Dummy> val2 = Dummy();
    112     val = std::move(val2);
    113   }
    114 }
    115 
    116 TEST(MaybeTest, Equality) {
    117   Maybe<int> a = 1;
    118   Maybe<int> b = 1;
    119   Maybe<int> c;
    120 
    121   Maybe<int> emptyA, emptyB;
    122 
    123   EXPECT_EQ(a, b);
    124   EXPECT_EQ(b, a);
    125   EXPECT_NE(a, c);
    126   EXPECT_EQ(emptyA, emptyB);
    127 }
    128 
    129 }  // namespace aapt
    130