C ++ Serialize / Deserialize std :: map< int，int>从/到文件 [英] C++ Serialize/Deserialize std::map<int,int> from/to file

问题描述

我有一个std :: map。

I have an std::map.

我想知道如果我可以写它到一个文件（也从文件读取）

I would like to know if I can write it to a file (and also read it from a file) in like 1 line using fwrite, or if I need to write/read each value separately.

我希望自从没有什么特别的，这可能是可能的。

I was hoping that since is nothing special, this might be possible.

推荐答案

使用 boost :: serialization 在一行中序列化。
标题：

use boost::serialization for serialize in one line. Header for it:

boost/serialization/map.hpp

代码示例

#include <map>
#include <sstream>

#include <boost/serialization/map.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>

int main()
{
   std::map<int, int> map = {{1,2}, {2,1}};
   std::stringstream ss;
   boost::archive::text_oarchive oarch(ss);
   oarch << map;
   std::map<int, int> new_map;
   boost::archive::text_iarchive iarch(ss);
   iarch >> new_map;
   std::cout << (map == new_map) << std::endl;
}

输出：

g++ -o new new.cpp -std=c++0x -lboost_serialization
./new
1

只需使用 std :: ifstream / std :: ofstream ，而不是 std :: stringstream ，并且可以是 binary_archive ，而不是 text_archive 。

for file simply use std::ifstream/std::ofstream instead of std::stringstream and may be binary_archive, instead of text_archive.

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