utilities.hpp

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// Copyright 2014 Open Source Robotics Foundation, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#ifndef RCLCPP__UTILITIES_HPP_
#define RCLCPP__UTILITIES_HPP_
 
#include <chrono>
#include <functional>
#include <limits>
#include <string>
#include <vector>
 
#include "rclcpp/context.hpp"
#include "rclcpp/init_options.hpp"
#include "rclcpp/visibility_control.hpp"
 
#ifdef ANDROID
#include <sstream>
 
namespace std
{
template<typename T>
std::string to_string(T value)
{
  std::ostringstream os;
  os << value;
  return os.str();
}
}
#endif
 
namespace rclcpp
{
 
RCLCPP_PUBLIC
void
init(int argc, char const * const argv[], const InitOptions & init_options = InitOptions());
 
 
RCLCPP_PUBLIC
bool
install_signal_handlers();
 
RCLCPP_PUBLIC
bool
signal_handlers_installed();
 
 
RCLCPP_PUBLIC
bool
uninstall_signal_handlers();
 
 
RCLCPP_PUBLIC
std::vector<std::string>
init_and_remove_ros_arguments(
  int argc,
  char const * const argv[],
  const InitOptions & init_options = InitOptions());
 
 
RCLCPP_PUBLIC
std::vector<std::string>
remove_ros_arguments(int argc, char const * const argv[]);
 
 
RCLCPP_PUBLIC
bool
ok(rclcpp::Context::SharedPtr context = nullptr);
 
 
[[deprecated("use the function ok() instead, which has the same usage.")]]
RCLCPP_PUBLIC
bool
is_initialized(rclcpp::Context::SharedPtr context = nullptr);
 
 
RCLCPP_PUBLIC
bool
shutdown(
  rclcpp::Context::SharedPtr context = nullptr,
  const std::string & reason = "user called rclcpp::shutdown()");
 
 
RCLCPP_PUBLIC
void
on_shutdown(std::function<void()> callback, rclcpp::Context::SharedPtr context = nullptr);
 
 
RCLCPP_PUBLIC
bool
sleep_for(
  const std::chrono::nanoseconds & nanoseconds,
  rclcpp::Context::SharedPtr context = nullptr);
 
 
template<typename T>
bool
add_will_overflow(const T x, const T y)
{
  return (y > 0) && (x > (std::numeric_limits<T>::max() - y));
}
 
 
template<typename T>
bool
add_will_underflow(const T x, const T y)
{
  return (y < 0) && (x < (std::numeric_limits<T>::min() - y));
}
 
 
template<typename T>
bool
sub_will_overflow(const T x, const T y)
{
  return (y < 0) && (x > (std::numeric_limits<T>::max() + y));
}
 
 
template<typename T>
bool
sub_will_underflow(const T x, const T y)
{
  return (y > 0) && (x < (std::numeric_limits<T>::min() + y));
}
 
 
RCLCPP_PUBLIC
const char *
get_c_string(const char * string_in);
 
 
RCLCPP_PUBLIC
const char *
get_c_string(const std::string & string_in);
 
}  // namespace rclcpp
 
#endif  // RCLCPP__UTILITIES_HPP_