libmsgpack/msgpack-c/test/boost_fusion.cpp

#include <msgpack.hpp>
#include <sstream>
#include <iterator>
#include <cmath>

#include <gtest/gtest.h>

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#if defined(MSGPACK_USE_BOOST)

#include <boost/fusion/adapted/struct/define_struct.hpp>
#include <boost/fusion/adapted/struct/adapt_struct.hpp>

const double kEPS = 1e-10;

BOOST_FUSION_DEFINE_STRUCT(
    BOOST_PP_EMPTY(),
    mystruct,
    (int, f1)
    (double, f2)
    )

TEST(MSGPACK_BOOST, fusion_pack_unpack_convert)
{
    std::stringstream ss;
    mystruct val1;
    val1.f1 = 42;
    val1.f2 = 123.45;
    msgpack::pack(ss, val1);
    msgpack::unpacked ret;
    msgpack::unpack(ret, ss.str().data(), ss.str().size());
    mystruct val2 = ret.get().as<mystruct>();
    EXPECT_TRUE(val1.f1 == val2.f1);
    EXPECT_TRUE(fabs(val2.f2 - val1.f2) <= kEPS);
}

TEST(MSGPACK_BOOST, object_with_zone_convert)
{
    mystruct val1;
    val1.f1 = 42;
    val1.f2 = 123.45;
    msgpack::zone z;
    msgpack::object obj(val1, z);
    mystruct val2 = obj.as<mystruct>();
    EXPECT_TRUE(val1.f1 == val2.f1);
    EXPECT_TRUE(fabs(val2.f2 - val1.f2) <= kEPS);
}

#if !defined(MSGPACK_USE_CPP03)

struct no_def_con1 {
    no_def_con1() = delete;
    no_def_con1(int i):i(i) {}
    int i;
    MSGPACK_DEFINE(i);
};

inline bool operator==(no_def_con1 const& lhs, no_def_con1 const& rhs) {
    return lhs.i == rhs.i;
}

inline bool operator!=(no_def_con1 const& lhs, no_def_con1 const& rhs) {
    return !(lhs == rhs);
}

struct no_def_con2 {
    no_def_con2() = delete;
    no_def_con2(int i):i(i) {}
    int i;
    MSGPACK_DEFINE(i);
};

inline bool operator==(no_def_con2 const& lhs, no_def_con2 const& rhs) {
    return lhs.i == rhs.i;
}

inline bool operator!=(no_def_con2 const& lhs, no_def_con2 const& rhs) {
    return !(lhs == rhs);
}


namespace msgpack {
MSGPACK_API_VERSION_NAMESPACE(MSGPACK_DEFAULT_API_NS) {
namespace adaptor {

template <>
struct as<no_def_con1> {
    no_def_con1 operator()(msgpack::object const& o) const {
        if (o.type != msgpack::type::ARRAY) throw msgpack::type_error();
        if (o.via.array.size != 1) throw msgpack::type_error();
        return no_def_con1(o.via.array.ptr[0].as<int>());
    }
};

template <>
struct as<no_def_con2> {
    no_def_con2 operator()(msgpack::object const& o) const {
        if (o.type != msgpack::type::ARRAY) throw msgpack::type_error();
        if (o.via.array.size != 1) throw msgpack::type_error();
        return no_def_con2(o.via.array.ptr[0].as<int>());
    }
};

} // adaptor
} // MSGPACK_API_VERSION_NAMESPACE(MSGPACK_DEFAULT_API_NS)
} // msgpack

struct mystruct_no_def_con {
    mystruct_no_def_con() = delete;
    // Constructor that have parameters corresponding to BOOST_FUSION_ADAPT_STRUCT is mandatory.
    // See *1, *2, and *3
    mystruct_no_def_con(
        no_def_con1 i,
        no_def_con2 j,
        no_def_con1 k):
        f1(std::move(i)),
        f2(std::move(j)),
        f3(std::move(k)) {}

    no_def_con1 f1;
    no_def_con2 f2;
    no_def_con1 f3;
};

inline bool operator==(mystruct_no_def_con const& lhs, mystruct_no_def_con const& rhs) {
    return lhs.f1 == rhs.f1 && lhs.f2 == rhs.f2 && lhs.f3 == rhs.f3;
}

inline bool operator!=(mystruct_no_def_con const& lhs, mystruct_no_def_con const& rhs) {
    return !(lhs == rhs);
}

BOOST_FUSION_ADAPT_STRUCT(
    mystruct_no_def_con,
    f1, // *1
    f2, // *2
    f3  // *3
    )


// MSVC2015's std::tuple requires default constructor during 'as' process.
// It doesn't support Expression SFINAE yet, then 'as' is fallbacked to 'convert'.
// After MSVC would support Expression SFINAE, remove this guard.
#if !defined(_MSC_VER)

TEST(MSGPACK_BOOST, pack_convert_no_def_con)
{
    std::stringstream ss;
    mystruct_no_def_con val1(no_def_con1(1), no_def_con2(2), no_def_con1(3));
    msgpack::pack(ss, val1);
    msgpack::unpacked ret;
    msgpack::unpack(ret, ss.str().data(), ss.str().size());
    mystruct_no_def_con val2 = ret.get().as<mystruct_no_def_con>();
    EXPECT_TRUE(val1 == val2);
}

#endif // !defined(_MSC_VER)

#endif // !defined(MSGPACK_USE_CPP03

#endif // defined(MSGPACK_USE_BOOST)