A header-only cross-platform C++17 library for memory-mapping files
Boost I/O Performance with <memmap.hpp> instead of <fstream>
#include <memmap.hpp>
#include <iostream>
int main(){
filemap<true> fmr("file1.txt"); //Read-only access
//Same as const_filemap
filemap<false> fmrw("file2.txt"); //Read-Write access
//fmr.resize(1024); <- Error, resizing read-only file!
std::cout << fmr.size() << "\n";
fmrw.resize(1024); //Truncates or extends the file
std::cout << fmrw.size() << "\n";
for(int i = 0;i < fmrw.size();i++){
fmrw[i] = 'a' + (i % 26); //Changing data in read-write mode
}
std::for_each(fmr.begin(), fmr.end(), [](const char& x){/*...*/});
std::generate(fmrw.begin(), fmrw.end(), []{/*...*/});
fmr.close(); //Destructors would also do the job;
fmrw.close(); //Calling close() is optional here.
}