[英]boost.serialization and lazy initialization
i need to serialize directory tree. 我需要序列化目录树。 i have no trouble with this type:
我没有这种类型的麻烦:
std::map<
std::string, // string(path name)
std::vector<std::string> // string array(file names in the path)
> tree;
but for the serialization the directory tree with the content i need other type: 但是对于序列化目录树与内容我需要其他类型:
std::map<
std::string, // string(path name)
std::vector< // files array
std::pair<
std::string, // file name
std::vector< // array of file pieces
std::pair< // <<<<<<<<<<<<<<<<<<<<<< for this i need lazy initialization
std::string, // piece buf
boost::uint32_t // crc32 summ on piece
>
>
>
>
> tree;
how can i initialize the object of type "std::pair" in the moment of its serialization? 我如何在序列化时初始化 “ std :: pair”类型的对象? ie read file piece/calculate crc32 summ.
即读取文件/计算crc32 summ。
up 向上
I dont quite understand the question, but #including "boost/serialization/utility.hpp" gives you the implementation for serialising std::pair. 我不太了解这个问题,但是#include“ boost / serialization / utility.hpp”为您提供了序列化std :: pair的实现。
If you want to load the area of your code later on, then I think the best way would be to create a custom pair class: 如果以后要加载代码区域,那么我认为最好的方法是创建一个自定义对类:
class custom_pair : std::pair< std::string, // piece buf
boost::uint32_t > // crc32 summ on piece
{
};
//...
std::vector< // array of file pieces
custom_pair // <<<<<<<<<<<<<<<<<<<<<< for this i need lazy initialization
>
//...
template< class Archive >
void serialize( Archive & ar, custom_pair & p, const unsigned int version ) {
ar & boost::serialization::make_nvp( "std::pair", std::pair<...>( p ) );
}
template<class Archive>
inline void load_construct_data( Archive & ar, custom_pair * p, const unsigned int file_version ) {
std::string first;
boost::uint32_t second;
ar & boost::serialization::make_nvp( "first", first_ );
ar & boost::serialization::make_nvp( "second", second_ );
::new( t )custom_pair;
//...
}
template<class Archive>
inline void save_construct_data( Archive & ar, const custom_pair * p, const unsigned int file_version ) {
ar & boost::serialization::make_nvp( "first", t->first );
ar & boost::serialization::make_nvp( "second", t->second );
}
I would replace the std::string
in the vector by a custom class, let me say MyFileNames
我将用自定义类替换向量中的
std::string
,让我说MyFileNames
class MyFileNames : std::string
{
// add forward constructors as needed
};
std::map<
std::string, // string(path name)
std::vector<MyFileNames> // string array(file names in the path)
> tree;
And define the save
serialization function for MyFileNames
by converting the std::string to a 并通过将std :: string转换为
MyFileNames
来定义MyFileNames
的save
序列化函数
std::pair<
std::string, // file name
std::vector< // array of file pieces
std::pair< // <<<<<<<<<<<<<<<<<<<<<< for this i need lazy initialization
std::string, // piece buf
boost::uint32_t // crc32 summ on piece
>
>
>
and the serialize this type. 并序列化此类型。 This let you evaluate the lazy part only the data is serialized.
这使您可以仅对数据进行序列化来评估惰性部分。 For the load you could ignore the lazy data, as I suppose that this data can be calculated.
对于负载,您可以忽略惰性数据,因为我认为可以计算该数据。
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