flatdata-cpp

flatdata-cpp

C++ 11 implementation of flatdata

Building

First, install the requirements of the generator and build flatdata-cpp.

pip3 install -r flatdata-generator/requirements.txt
cd flatdata-cpp
mkdir build &&cd build
cmake ..
make
make test# optional

Usage & basic example

Once you have created a flatdata schema file, you can generate a C++ header:

./generator --gen cpp --schema locations.flatdata --output-file locations.hpp

Serialize some data:

// Compile with: c++ -std=c++11 writer.cpp -Iflatdata-cpp/include -Lbuild/flatdata-cpp -lflatdata -lboost_system -lboost_filesystem -o writer
#include"locations.hpp"intmain() {
auto storage = flatdata::FileResourceStorage::create("locations.archive"); // create storageauto builder = loc::LocationsBuilder::open(std::move(storage)); // create builderauto pois = builder.start_pois();
uint32_t x, y;
while(std::cin >> x >> y) {
loc::PointMutator poi = pois.grow();
poi.x = x;
poi.y = y;
}
pois.close(); // flush not yet written data to disk
}

And finally, read the serialized data:

// Compile with: c++ -std=c++11 reader.cpp -Iflatdata-cpp/include -Lbuild/flatdata-cpp -lflatdata -lboost_system -lboost_filesystem -o reader
#include"locations.hpp"
#include<iostream>intmain() {
auto storage = flatdata::FileResourceStorage::create("locations.archive"); // open storageauto archive = loc::Locations::open(std::move(storage)); // create archivefor (loc::Point point : archive.pois()) { // iterate through pois
std::cout << point.to_string() << std::endl;
}
return0;
}

For more examples cf. the examples directory.