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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 "test/Common.h"
     18 #include "util/Maybe.h"
     19 
     20 #include <gtest/gtest.h>
     21 #include <string>
     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
     30                   << "} with data=0x" << (void*) data
     31                   << std::endl;
     32     }
     33 
     34     Dummy(const Dummy& rhs) {
     35         data = nullptr;
     36         if (rhs.data) {
     37             data = new int;
     38             *data = *rhs.data;
     39         }
     40         std::cerr << "CopyConstruct Dummy{0x" << (void *) this
     41                   << "} from Dummy{0x" << (const void*) &rhs
     42                   << "}" << std::endl;
     43     }
     44 
     45     Dummy(Dummy&& rhs) {
     46         data = rhs.data;
     47         rhs.data = nullptr;
     48         std::cerr << "MoveConstruct Dummy{0x" << (void *) this
     49                   << "} from Dummy{0x" << (const void*) &rhs
     50                   << "}" << std::endl;
     51     }
     52 
     53     Dummy& operator=(const Dummy& rhs) {
     54         delete data;
     55         data = nullptr;
     56 
     57         if (rhs.data) {
     58             data = new int;
     59             *data = *rhs.data;
     60         }
     61         std::cerr << "CopyAssign Dummy{0x" << (void *) this
     62                   << "} from Dummy{0x" << (const void*) &rhs
     63                   << "}" << std::endl;
     64         return *this;
     65     }
     66 
     67     Dummy& operator=(Dummy&& rhs) {
     68         delete data;
     69         data = rhs.data;
     70         rhs.data = nullptr;
     71         std::cerr << "MoveAssign Dummy{0x" << (void *) this
     72                   << "} from Dummy{0x" << (const void*) &rhs
     73                   << "}" << std::endl;
     74         return *this;
     75     }
     76 
     77     ~Dummy() {
     78         std::cerr << "Destruct Dummy{0x" << (void *) this
     79                   << "} with data=0x" << (void*) data
     80                   << std::endl;
     81         delete data;
     82     }
     83 
     84     int* data;
     85 };
     86 
     87 TEST(MaybeTest, MakeNothing) {
     88     Maybe<int> val = make_nothing<int>();
     89     AAPT_EXPECT_FALSE(val);
     90 
     91     Maybe<std::string> val2 = make_nothing<std::string>();
     92     AAPT_EXPECT_FALSE(val2);
     93 
     94     val2 = make_nothing<std::string>();
     95     AAPT_EXPECT_FALSE(val2);
     96 }
     97 
     98 TEST(MaybeTest, MakeSomething) {
     99     Maybe<int> val = make_value(23);
    100     AAPT_ASSERT_TRUE(val);
    101     EXPECT_EQ(23, val.value());
    102 
    103     Maybe<std::string> val2 = make_value(std::string("hey"));
    104     AAPT_ASSERT_TRUE(val2);
    105     EXPECT_EQ(std::string("hey"), val2.value());
    106 }
    107 
    108 TEST(MaybeTest, Lifecycle) {
    109     Maybe<Dummy> val = make_nothing<Dummy>();
    110 
    111     Maybe<Dummy> val2 = make_value(Dummy());
    112 }
    113 
    114 TEST(MaybeTest, MoveAssign) {
    115     Maybe<Dummy> val;
    116     {
    117         Maybe<Dummy> val2 = Dummy();
    118         val = std::move(val2);
    119     }
    120 }
    121 
    122 TEST(MaybeTest, Equality) {
    123     Maybe<int> a = 1;
    124     Maybe<int> b = 1;
    125     Maybe<int> c;
    126 
    127     Maybe<int> emptyA, emptyB;
    128 
    129     EXPECT_EQ(a, b);
    130     EXPECT_EQ(b, a);
    131     EXPECT_NE(a, c);
    132     EXPECT_EQ(emptyA, emptyB);
    133 }
    134 
    135 } // namespace aapt
    136