Question

在提升巴士时间表示例代码中 bus schedule sample 我尝试反序列化char数组中的数据。所以我添加了这个功能。但它有这个错误。有什么问题？

void frombuffer_schedule(char* buffer,const bus_schedule& obj)
{     
    boost::iostreams::stream<boost::iostreams::array_source>  is(buffer, 4096);
    boost::archive::binary_iarchive ia(is,boost::archive::archive_flags::no_header);
    ia >> obj;
}

错误是“错误：静态断言失败：typex :: value”

Answer 1

您正在反序列化为const对象。这是失败断言的实际代码：

// cannot load data into a "const" object unless it's a
// wrapper around some other non-const object.
BOOST_STATIC_ASSERT(typex::value);

所以，解决它：）

<强> Live On Coliru

#include <boost/serialization/string.hpp>
#include <boost/serialization/serialization.hpp>

struct MyData {
    std::string s;
    float values[7];

  private:
    friend class boost::serialization::access;
    template <typename Ar>
    void serialize(Ar& ar, unsigned) { ar & s & values; }
};

#include <boost/iostreams/device/array.hpp>
#include <boost/iostreams/device/back_inserter.hpp>
#include <boost/iostreams/stream.hpp>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
namespace bio = boost::iostreams;

std::vector<char> to_buffer(const MyData& obj) {     
    std::vector<char> buffer;

    bio::stream<bio::back_insert_device<std::vector<char> > > os(buffer);

    namespace ba = boost::archive;
    ba::binary_oarchive oa(os, ba::archive_flags::no_header);

    oa << obj;
    return buffer;
}

void from_buffer(char* buffer, MyData& obj) {     
    bio::stream<bio::array_source> is(buffer, 4096);

    namespace ba = boost::archive;
    ba::binary_iarchive ia(is, ba::archive_flags::no_header);

    ia >> obj;
}

#include <iostream>
#include <iomanip>

static inline std::ostream& operator<<(std::ostream& os, MyData const& object) {
    os << "s:" << std::quoted(object.s) << ", values:[";
    for (float v : object.values)
        os << " " << v;
    return os << " ]";
}

int main() {
    auto buffer = to_buffer(MyData { "hello world", { 1,2,3,4,5,6,7 } });

    MyData received;
    from_buffer(buffer.data(), received);

    std::cout << "Received: " << received << "\n";
}

打印

Received: s:"hello world", values:[ 1 2 3 4 5 6 7 ]

c ++ boost将char数组反序列化为obj

1 个答案: