Boost序列化boost：：数组失败

Question

我正在尝试这个链接的示例：https://theboostcpplibraries.com/boost.serialization-wrappers

但是，直接序列化boost::array编译的示例失败了：

#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/array.hpp>
#include <iostream>
#include <sstream>

using namespace boost::archive;

std::stringstream ss;

void save()
{
  text_oarchive oa{ss};
  boost::array<int, 3> a{{0, 1, 2}};
  oa << a;
}

void load()
{
  text_iarchive ia{ss};
  boost::array<int, 3> a;
  ia >> a;
  std::cout << a[0] << ", " << a[1] << ", " << a[2] << '\n';
}

int main()
{
  save();
  load();
}

错误代码的一部分显示如下：

In files included from /usr/local/lib/libboost1.65.1/include/boost/serialization/extended_type_info_typeid.hpp:37:0,
/usr/local/lib/libboost1.65.1/include/boost/archive/detail/oserialzer.hpp:39,
/usr/local/lib/libboost1.65.1/include/boost/archive/detail/interface_oarchive.hpp:23,
/usr/local/lib/libboost1.65.1/include/boost/archive/detail/common_oarchive.hpp:22,
/usr/local/lib/libboost1.65.1/include/boost/archive/basic_text_oarchive.hpp:29,
/usr/local/lib/libboost1.65.1/include/boost/archive/text_oarchive.hpp:31,
from test.cpp:1:

/usr/local/lib/libboost1.65.1/include/boost/serialization/access.hpp: In instantiation of 'static void boost:serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive; T = boost_array<int, 3ul>]':
/usr/local/lib/libboost1.65.1/include/boost/serialization/serialization.hpp:68:69: required from 'void boost:serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive; T = boost_array<int, 3ul>]'
/usr/local/lib/libboost1.65.1/include/boost/serialization/serialization.hpp:126:23: required from 'void boost:serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive; T = boost_array<int, 3ul>]'
..................
test.cpp:15:9: required from here
/usr/include/boost/serialization/access.hpp:116:9: error: 'class boost::array<int, 3ul>' has no member named serialize'
   t.serialize(ar, file_version);
   ^

我的系统配置:Ubuntu18.04+ Boost 1.65.1

我已经在lib路径/usr/local/ lib /libbost1.65.1/中手动安装了boost 1.65.1，在lib路径/usr/lib/x86_64-linux-gnu/中安装了boost 1.65.1。不幸的是，两个编译的库都以相同的错误失败。

但是，如果boost数组使用包装器函数boost::serialization::make_array()，它将编译OK并工作。

#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/serialization/array.hpp>
#include <array>
#include <iostream>
#include <sstream>

using namespace boost::archive;

std::stringstream ss;

void save()
{
  text_oarchive oa{ss};
  std::array<int, 3> a{{0, 1, 2}};
  oa << boost::serialization::make_array(a.data(), a.size());
}

void load()
{
  text_iarchive ia{ss};
  std::array<int, 3> a;
  ia >> boost::serialization::make_array(a.data(), a.size());
  std::cout << a[0] << ", " << a[1] << ", " << a[2] << '\n';
}

int main()
{
  save();
  load();
}

否则我会手动更改行

oa << a;

和

ia >> a;

至

oa << boost::serialization::make_array(a.data(), a.size());

和

ia >> boost::serialization::make_array(a.data(), a.size());

它也会编译好的。

Answer 1

全局变量ss会引发危险信号。以这种方式分享可能会产生意想不到的后果：

• 首先，住宅的内容可能仍然存在。
• 更微妙的是，在需要时可能没有同花顺。

此外，您似乎缺少了用于数组序列化的include：

#include <boost/serialization/boost_array.hpp>

将其添加为使其编译，但我们还将修复函数接口以删除全局的：

住在Coliru

#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/array.hpp>
#include <boost/serialization/array.hpp>
#include <boost/serialization/boost_array.hpp>
#include <iostream>
#include <sstream>

std::string save()
{
    std::ostringstream            ss;
    boost::archive::text_oarchive oa{ss};

    boost::array<int, 3> a{{0, 1, 2}};
    oa << a;

    return std::move(ss).str();
}

void load(std::string text)
{
    std::istringstream ss(std::move(text));
    boost::archive::text_iarchive ia{ss};

    boost::array<int, 3> a;
    ia >> a;
    std::cout << a[0] << ", " << a[1] << ", " << a[2] << '\n';
}

int main()
{
    auto text = save();
    load(text);
}

打印

0, 1, 2

Answer 2

我发现了这个错误的根本原因:我使用的gcc和g++版本是tooooo : g++ 4.8.0。Ubuntu18.04中的默认gcc和g++版本为7.5.0

我之所以使用g++ 4.8.0，是因为我想在我的Ubuntu中安装阿波罗自动驾驶工具包。然后，我也想在我的Ubuntu中尝试LIO映射工具包。但是出现了致命的错误，即LIO以及诸如Boost、gtsam和ROS这样的依赖项无法由g++ 4.8.0编译。

因此，请注意编译环境。