MessagePackBuilder.h

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#pragma once
 
#include <mc_rtc/utils_api.h>
 
#include <mc_rbdyn/Gains.h>
 
#include <SpaceVecAlg/SpaceVecAlg>
 
#include <Eigen/Core>
#include <array>
#include <exception>
#include <map>
#include <memory>
#include <set>
#include <string>
#include <type_traits>
#include <variant>
#include <vector>
 
namespace mc_rtc
{
 
struct Configuration;
struct MessagePackBuilder;
struct MessagePackBuilderImpl;
 
namespace internal
{
 
template<typename T>
constexpr bool is_integral_v = std::is_integral_v<T> || std::numeric_limits<std::decay_t<T>>::is_integer;
 
template<typename RefT, typename T>
constexpr bool is_like()
{
  static_assert(std::is_integral_v<RefT>);
  if constexpr(is_integral_v<T>)
  {
    // clang-format off
    return std::numeric_limits<T>::is_signed == std::is_signed_v<RefT>
           && std::numeric_limits<T>::max() == std::numeric_limits<RefT>::max();
    // clang-format on
  }
  return false;
}
 
template<typename T>
constexpr bool is_like_int8_t = is_like<int8_t, T>();
template<typename T>
constexpr bool is_like_int16_t = is_like<int16_t, T>();
template<typename T>
constexpr bool is_like_int32_t = is_like<int32_t, T>();
template<typename T>
constexpr bool is_like_int64_t = is_like<int64_t, T>();
template<typename T>
constexpr bool is_like_uint8_t = is_like<uint8_t, T>();
template<typename T>
constexpr bool is_like_uint16_t = is_like<uint16_t, T>();
template<typename T>
constexpr bool is_like_uint32_t = is_like<uint32_t, T>();
template<typename T>
constexpr bool is_like_uint64_t = is_like<uint64_t, T>();
 
template<typename T, typename = void>
struct has_write_builder : std::false_type
{
};
 
template<typename T>
struct has_write_builder<T, std::void_t<decltype(std::declval<const T &>().write(std::declval<MessagePackBuilder &>()))>>
: std::true_type
{
};
 
template<typename T>
static inline constexpr bool has_write_builder_v = has_write_builder<T>::value;
 
} // namespace internal
 
struct MC_RTC_UTILS_DLLAPI MessagePackBuilder
{
  MessagePackBuilder(std::vector<char> & buffer);
 
  ~MessagePackBuilder();
 
  void write();
  void write(bool b);
  void write(int8_t i);
  void write(int16_t i);
  void write(int32_t i);
  void write(int64_t i);
  void write(uint8_t i);
  void write(uint16_t i);
  void write(uint32_t i);
  void write(uint64_t i);
  void write(float f);
  void write(double d);
  void write(const std::string & s);
  void write(const char * s);
  void write(const char * s, size_t len);
 
  /* End Add data to the MessagePack section */
 
  void write(const Eigen::Vector2d & v);
 
  void write(const Eigen::Vector3d & v);
 
  void write(const Eigen::Vector4d & v);
 
  void write(const Eigen::Vector6d & v);
 
  void write(const Eigen::VectorXd & v);
 
  template<int N, int _Options, int _MaxRows, int _MaxCols>
  void write(const Eigen::Matrix<double, N, 1, _Options, _MaxRows, _MaxCols> & v)
  {
    static_assert(N != -1 && N != 2 && N != 3 && N != 6, "Should have gone to specialized function");
    start_array(static_cast<size_t>(N));
    for(Eigen::Index i = 0; i < N; ++i) { write(v(i)); }
    finish_array();
  }
 
  void write(const Eigen::Quaterniond & q);
 
  void write(const Eigen::Matrix3d & m);
 
  void write(const sva::PTransformd & pt);
 
  void write(const sva::ForceVecd & fv);
 
  void write(const sva::MotionVecd & mv);
 
  void write(const sva::ImpedanceVecd & mv);
 
  void write(const mc_rtc::Configuration & config);
 
  template<typename T, typename std::enable_if_t<internal::is_integral_v<T>, int> = 0>
  void write(const T & number)
  {
    if constexpr(internal::is_like_int8_t<T>) { write(static_cast<int8_t>(number)); }
    else if constexpr(internal::is_like_int16_t<T>) { write(static_cast<int16_t>(number)); }
    else if constexpr(internal::is_like_int32_t<T>) { write(static_cast<int32_t>(number)); }
    else if constexpr(internal::is_like_int64_t<T>) { write(static_cast<int64_t>(number)); }
    else if constexpr(internal::is_like_uint8_t<T>) { write(static_cast<uint8_t>(number)); }
    else if constexpr(internal::is_like_uint16_t<T>) { write(static_cast<uint16_t>(number)); }
    else if constexpr(internal::is_like_uint32_t<T>) { write(static_cast<uint32_t>(number)); }
    else if constexpr(internal::is_like_uint64_t<T>) { write(static_cast<uint64_t>(number)); }
    else { static_assert(!std::is_same_v<T, T>, "T is integral but has an unsupported size"); }
  }
 
  template<typename T, typename = std::enable_if_t<internal::has_write_builder_v<T>>>
  void write(const T & value)
  {
    value.write(*this);
  }
 
  /* End Add data to the MessagePack section (advanced) */
 
  template<typename T, typename A>
  void write(const std::vector<T, A> & v)
  {
    start_array(v.size());
    for(const auto & value : v) { write(value); }
    finish_array();
  }
 
  template<typename T, std::size_t N>
  void write(const std::array<T, N> & a)
  {
    start_array(N);
    for(const auto & value : a) { write(value); }
    finish_array();
  }
 
  template<typename T1, typename T2>
  void write(const std::pair<T1, T2> & p)
  {
    start_array(2);
    write(p.first);
    write(p.second);
    finish_array();
  }
 
  template<typename KeyT, typename T, typename C, typename A>
  void write(const std::map<KeyT, T, C, A> & m)
  {
    start_map(m.size());
    for(const auto & p : m)
    {
      write(p.first);
      write(p.second);
    }
    finish_map();
  }
 
  template<typename T, typename C, typename A>
  void write(const std::set<T, C, A> & s)
  {
    start_array(s.size());
    for(const auto & value : s) { write(value); }
    finish_array();
  }
 
  template<typename... Args>
  void write(const std::tuple<Args...> & t)
  {
    start_array(sizeof...(Args));
    write_impl<0>(t);
    finish_array();
  }
 
  template<typename... Args>
  void write(const std::variant<Args...> & value)
  {
    start_array(2);
    write(value.index());
    std::visit([this](const auto & v) { write(v); }, value);
    finish_array();
  }
 
  template<typename Type, int Options, typename StrideType>
  void write(const Eigen::Ref<Type, Options, StrideType> & v)
  {
#if !EIGEN_VERSION_AT_LEAST(3, 2, 90)
    using Index = Eigen::DenseIndex;
#else
    using Index = Eigen::Index;
#endif
    start_array(v.size());
    for(Index i = 0; i < v.size(); ++i) { write(v(i)); }
    finish_array();
  }
 
  /* End Add data to the MessagePack section (containers) */
 
  void start_array(size_t size);
 
  void finish_array();
 
  void start_map(size_t size);
 
  void finish_map();
 
  void write_object(const char * data, size_t s);
 
  size_t finish();
 
private:
  std::unique_ptr<MessagePackBuilderImpl> impl_;
 
  template<size_t i,
           typename... Args,
           typename std::enable_if<i<sizeof...(Args), int>::type = 0> void write_impl(const std::tuple<Args...> & t)
  {
    write(std::get<i>(t));
    write_impl<i + 1>(t);
  }
 
  template<size_t i, typename... Args, typename std::enable_if<i >= sizeof...(Args), int>::type = 0>
  void write_impl(const std::tuple<Args...> &)
  {
  }
};
 
} // namespace mc_rtc