bitsery/examples/bit_packing.cpp

#include <bitsery/bitsery.h>
#include <bitsery/adapter/buffer.h>
//we'll be using std::array as a buffer type, so include traits for this
#include <bitsery/traits/array.h>
#include <bitsery/traits/string.h>
#include <bitsery/traits/vector.h>
//include extension that will allow to compress our data
#include <bitsery/ext/value_range.h>

namespace MyTypes {

    struct Vec3 { float x, y, z; };

    struct Monster {
        Vec3 pos;
        std::vector<Vec3> path;
        std::string name;
    };

    template<typename S>
    void serialize(S& s, MyTypes::Vec3 &o) {
        s.value4b(o.x);
        s.value4b(o.y);
        s.value4b(o.z);
    }

    template <typename S>
    void serialize (S& s, Monster& o) {
        s.text1b(o.name, 20);
        s.object(o.pos);
        //compress path in a range of -1.0 .. 1.0 with 0.01 precision
        //enableBitPacking creates separate serializer/deserializer object, that contains bit packing operations
        s.enableBitPacking([&o](typename S::BPEnabledType& sbp) {
            sbp.container(o.path, 1000, [](typename S::BPEnabledType& sbp, Vec3& vec3) {
                constexpr bitsery::ext::ValueRange<float> range{-1.0f,1.0f, 0.01f};
                sbp.ext(vec3.x, range);
                sbp.ext(vec3.y, range);
                sbp.ext(vec3.z, range);
            });
        });
    }
}

//use fixed-size buffer
using Buffer = std::array<uint8_t, 10000>;
using OutputAdapter = bitsery::OutputBufferAdapter<Buffer>;
using InputAdapter = bitsery::InputBufferAdapter<Buffer>;

int main() {
    //set some random data
    MyTypes::Monster data{};
    data.name = "lew";

    //create buffer to store data to
    Buffer buffer{};
    auto writtenSize = bitsery::quickSerialization<OutputAdapter>(buffer, data);

    MyTypes::Monster res{};
    auto state = bitsery::quickDeserialization<InputAdapter>({buffer.begin(), writtenSize}, res);

    assert(state.first == bitsery::ReaderError::NoError && state.second);
}