bitsery/tests/serialization_ext_std_variant.cpp

//MIT License
//
//Copyright (c) 2019 Mindaugas Vinkelis
//
//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:
//
//The above copyright notice and this permission notice shall be included in all
//copies or substantial portions of the Software.
//
//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//SOFTWARE.

#include <gmock/gmock.h>
#include "serialization_test_utils.h"


#if __cplusplus > 201402L

using testing::Eq;

#include <bitsery/ext/std_variant.h>

template<typename T, size_t N>
using OverloadValue = bitsery::ext::OverloadValue<T, N>;

TEST(SerializeExtensionStdVariant, UseSerializeFunction) {

    std::variant<MyStruct1, MyStruct2> t1{MyStruct1{978, 15}};
    std::variant<MyStruct1, MyStruct2> r1{MyStruct2{}};
    SerializationContext ctx;
    ctx.createSerializer().ext(t1, bitsery::ext::StdVariant{});
    ctx.createDeserializer().ext(r1, bitsery::ext::StdVariant{});
    EXPECT_THAT(t1, Eq(r1));
}

TEST(SerializeExtensionStdVariant, WhenTwoIndicesWithSameTypeThenDeserializeCorrectIndex) {

    std::variant<MyStruct1, MyStruct2, MyStruct1> t1{std::in_place_index_t<2>{}, MyStruct1{978, 15}};
    std::variant<MyStruct1, MyStruct2, MyStruct1> r1{MyStruct2{}};
    SerializationContext ctx;
    ctx.createSerializer().ext(t1, bitsery::ext::StdVariant{});
    ctx.createDeserializer().ext(r1, bitsery::ext::StdVariant{});
    EXPECT_THAT(t1, Eq(r1));
}

TEST(SerializeExtensionStdVariant, ValueTypesCanBeSerializedWithLambda) {

    std::variant<float, char, MyStruct1> t1{5.6f};
    std::variant<float, char, MyStruct1> r1{MyStruct1{}};
    SerializationContext ctx;
    auto fncFloat = [](auto& s, float& v) {
        s.value4b(v);
    };
    auto fncChar = [](auto& s, char& v) {
        s.value1b(v);
    };
    ctx.createSerializer().ext(t1, bitsery::ext::StdVariant{fncFloat, fncChar});
    ctx.createDeserializer().ext(r1, bitsery::ext::StdVariant{fncFloat, fncChar});
    EXPECT_THAT(t1, Eq(r1));
}

TEST(SerializeExtensionStdVariant, ValueTypesCanBeSerializedWithLambdaAndOrCallableObject) {
    std::variant<float, char, MyStruct1> t1{'Z'};
    std::variant<float, char, MyStruct1> r1{MyStruct1{}};
    SerializationContext ctx;
    auto fncFloat = [](auto& s, float& v) {
        s.value4b(v);
    };

    ctx.createSerializer().ext(t1, bitsery::ext::StdVariant{fncFloat, OverloadValue<char, 1>{}});
    ctx.createDeserializer().ext(r1, bitsery::ext::StdVariant{fncFloat, OverloadValue<char, 1>{}});
    EXPECT_THAT(t1, Eq(r1));
}

TEST(SerializeExtensionStdVariant, CanOverloadDefaultSerializationFunction) {
    std::variant<MyStruct2, MyStruct1, int32_t> t1{MyStruct1{5, 9}};
    std::variant<MyStruct2, MyStruct1, int32_t> r1{MyStruct1{}};
    SerializationContext ctx;
    auto exec = [](auto& s, std::variant<MyStruct2, MyStruct1, int32_t>& o) {
        using S = decltype(s);
        s.ext(o, bitsery::ext::StdVariant{
            [](S& s, MyStruct1& v) {
                s.value4b(v.i1);
                //do not serialize other element, it should be 0 (default)
            },
            OverloadValue<int32_t, 4>{}
        });
    };

    ctx.createSerializer().object(t1, exec);
    ctx.createDeserializer().object(r1, exec);
    EXPECT_THAT(std::get<1>(r1).i2, Eq(0));
}


struct NonDefaultConstructable {
    explicit NonDefaultConstructable(float x) : _x{x} {}

    float _x;

    bool operator==(const NonDefaultConstructable& rhs) const {
        return _x == rhs._x;
    }

private:
    friend class bitsery::Access;

    NonDefaultConstructable() : _x{0.0f} {};
};

TEST(SerializeExtensionStdVariant, CanUseNonDefaultConstructableTypes) {
    std::variant<NonDefaultConstructable, MyStruct1, int32_t> t1{NonDefaultConstructable{123.456f}};
    std::variant<NonDefaultConstructable, MyStruct1, int32_t> r1{MyStruct1{}};
    SerializationContext ctx;

    auto exec = [](auto& s, std::variant<NonDefaultConstructable, MyStruct1, int32_t>& o) {
        using S = decltype(s);
        s.ext(o, bitsery::ext::StdVariant{
            [](S& s, NonDefaultConstructable& v) {
                s.value4b(v._x);
            },
            OverloadValue<int32_t, 4>{}
        });
    };

    ctx.createSerializer().object(t1, exec);
    ctx.createDeserializer().object(r1, exec);

    EXPECT_THAT(t1, Eq(r1));
}


TEST(SerializeExtensionStdVariant, CorrectlyHandleMonoState) {
    std::variant<std::monostate, NonDefaultConstructable, MyStruct1> t1{};
    std::variant<std::monostate, NonDefaultConstructable, MyStruct1> r1{};
    SerializationContext ctx;

    auto exec = [](auto& s, auto& o) {
        using S = decltype(s);
        s.ext(o, bitsery::ext::StdVariant{
            [](S& s, NonDefaultConstructable& v) {
                s.value4b(v._x);
            },
        });
    };

    ctx.createSerializer().object(t1, exec);
    ctx.createDeserializer().object(r1, exec);

    EXPECT_THAT(t1, Eq(r1));
    std::variant<std::monostate> t2{};
    std::variant<std::monostate> r2{};
    SerializationContext ctx1;
    ctx1.createSerializer().ext(t2, bitsery::ext::StdVariant{});
    ctx1.createDeserializer().ext(r2, bitsery::ext::StdVariant{});
    EXPECT_THAT(t2, Eq(r2));

}

#else
#if defined(_MSC_VER)
#pragma message("Tests for StdVariant requires C++17")
#else
#warning "Tests for StdVariant requires C++17"
#endif
#endif