boost :: archive :: text_oarchive的简单扩展 [英] Simple extension of boost::archive::text_oarchive
问题描述
我正在尝试将成员变量添加到Boost存档类中.在此之后,我想到了:/p>
I am trying to add a member variable to a Boost archive class. Following this, I came up with:
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <fstream>
class MyOArchive : public boost::archive::text_oarchive_impl<MyOArchive>
{
public:
bool MyData;
friend class boost::archive::detail::common_oarchive<MyOArchive>;
friend class basic_text_oarchive<MyOArchive>;
//friend class boost::serialization::save_access; // save_access in namespace boost::serialization does not name a type
MyOArchive(std::ostream& os, unsigned int flags = 0) : boost::archive::text_oarchive_impl<MyOArchive>(os, flags) {}
};
class MyClass
{
public:
private:
friend class boost::serialization::access;
double Value;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & Value;
}
};
int main()
{
MyClass myClass;
std::ofstream outputStream("test.txt");
//boost::archive::text_oarchive outputArchive(outputStream);
MyOArchive outputArchive(outputStream);
outputArchive << myClass;
outputStream.close();
return 0;
}
但是,我收到链接器错误:
However, I am getting linker errors:
对boost :: archive :: text_oarchive_impl< MyOArchive> :: text_oarchive_impl(std :: ostream& ;, unsigned int)的未定义引用
任何人都可以解释这里出了什么问题吗?我不需要重新实现存档的任何功能,只需将此成员附加 MyData
.
Can anyone explain what is going wrong here? I don't need to reimplement any of the functions of the archive, just attach this member MyData
.
推荐答案
啊.发现了.
对于基本实现,您需要在链接到最终产品的一个TU中包含 ipp
.
You need to include the ipp
s for the basic implementations in exactly one TU that's linked into the end product.
#include <boost/archive/impl/basic_text_oarchive.ipp>
#include <boost/archive/impl/text_oarchive_impl.ipp>
此外, save_access
位于另一个 castle 命名空间中:
Also, save_access
lives in a different castle namespace:
friend class boost::archive::save_access;
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/impl/basic_text_oarchive.ipp>
#include <boost/archive/impl/text_oarchive_impl.ipp>
#include <fstream>
class MyOArchive : public boost::archive::text_oarchive_impl<MyOArchive> {
public:
bool MyData;
friend class boost::archive::detail::common_oarchive<MyOArchive>;
friend class basic_text_oarchive<MyOArchive>;
friend class boost::archive::save_access;
MyOArchive(std::ostream &os, unsigned int flags = 0) : boost::archive::text_oarchive_impl<MyOArchive>(os, flags) {}
};
class MyClass {
private:
friend class boost::serialization::access;
double Value;
template <class Archive> void serialize(Archive &ar, unsigned) { ar &Value; }
};
int main() {
MyClass myClass;
{
std::ofstream outputStream("test.txt");
MyOArchive outputArchive(outputStream);
outputArchive << myClass;
}
}
输出为
22 serialization::archive 13 0 0 6.95328877045326431e-310
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