c++ store vector<vector<float>> in file and reverse

方案来源：
https://stackoverflow.com/questions/15707537/how-to-save-vectorvectorvectorfloat-in-a-file-and-retrieve-data

解决方法：

#include <boost/archive/binary_iarchive.hpp>#include <boost/archive/binary_oarchive.hpp>#include <boost/serialization/string.hpp> #include <boost/serialization/export.hpp> #include <boost/serialization/vector.hpp>#include <boost/serialization/list.hpp>void saveFeaturesFile(vector<vector<float>> &features, string filename){     ofstream out(filename.c_str());    stringstream ss;    boost::archive::binary_oarchive oa(ss);     oa << features;    out << ss.str();    out.close();    }void loadFeaturesFile(vector<vector<float>> &features, string filename){    ifstream in(filename.c_str());    boost::archive::binary_iarchive ia(in);     ia >> features;        in.close();}

同时再编译过程中加入相应的boost库
ex:g++ -std=c++11 -o test Test.cpp **-L/usr/local/lib -lboost_iostreams -lboost_serialization**

方法2：

void saveVector(std::string path, const vector<vector<float> >& myVector){    std::ofstream FILE(path, std::ios::out | std::ofstream::binary);    // Store size of the outer vector    int s1 = myVector.size();    FILE.write(reinterpret_cast<const char *>(&s1), sizeof(s1));        // Now write each vector one by one    for (auto& v : myVector) {                 // Store its size        int size = v.size();        FILE.write(reinterpret_cast<const char *>(&size), sizeof(size));        // Store its contents        FILE.write(reinterpret_cast<const char *>(&v[0]), v.size()*sizeof(float));    }    FILE.close();   }void readVector(std::string path,  vector<vector<float> >& myVector){    ifstream FILE(path, std::ios::in | std::ifstream::binary);    int size = 0;    FILE.read(reinterpret_cast<char *>(&size), sizeof(size));    myVector.resize(size);    for (int n = 0; n < size; ++n) {        int size2 = 0;        FILE.read(reinterpret_cast<char *>(&size2), sizeof(size2));        float f;                for ( int k = 0; k < size2; ++k ) {            FILE.read(reinterpret_cast<char *>(&f), sizeof(f));            myVector[n].push_back(f);           }    }}

来源：https://stackoverflow.com/questions/43230542/write-vectorvectorfloat-to-binary-file

以上两种方法，具体消耗时间未测试。

序列化资料：
https://www.ibm.com/developerworks/cn/aix/library/au-boostserialization/

http://blog.csdn.net/lanxuezaipiao/article/details/24845625