_TASK_STD_FUNCTION should be for everyone. #184
Description
The development environment
I’m working with Raspberry Pi Pico W’s on PlatformIO and my development environment is capable of building C++23 code. It has ARDUINO_ARCH_RP2040 defined and the __cplusplus expands to 202100L.
The problem
The documentation instructs to define _TASK_STD_FUNCTION in order to enable the support for std::function callbacks. However, defining it produces an error on my environment because of this microcontroller limitation.
TaskScheduler/src/TaskScheduler.h
Lines 285 to 290 in 4ccca1a
Why std::function callbacks are needed
This is necessary to call non-static class methods.
Buzzer(const std::uint8_t pin_number) noexcept
: pin_number{pin_number},
task{
TaskScheduler::immediate,
TaskScheduler::forever,
[this](void) -> void {this->play_the_next_note();},
&(TaskScheduler::scheduler)
} {
}My suggestion
It’s all about std::function.
TaskScheduler/src/TaskSchedulerDeclarations.h
Lines 125 to 134 in 4ccca1a
It might be more prudent to use the __cplusplus and __has_cpp_attribute for the C++ feature detection, instead of endlessly expanding the whitelist for future devices.
My temporary solution
The code works flawlessly with #define ARDUINO_ARCH_STM32.
// TaskScheduler.cpp
// Written on January 28, February 12, 24, March 2, 4, 7, 9–11, and 16, 2024.
////////////////////////////////////// 80 //////////////////////////////////////
module;
#define _TASK_SLEEP_ON_IDLE_RUN
#define _TASK_STD_FUNCTION
// Enable the support for “std::function” callbacks.
#define ARDUINO_ARCH_STM32 // Disguising as an STM32 microcontroller
// to suppress the “Support for std::function
// only for ESP8266 or ESP32 architecture” error.
#include <TaskScheduler.h> // Task, Scheduler, TASK_IMMEDIATE, TASK_FOREVER.
#undef ARDUINO_ARCH_STM32
export module TaskScheduler;
export namespace TaskScheduler {
inline constexpr unsigned long int immediate{TASK_IMMEDIATE};
inline constexpr long int forever{TASK_FOREVER};
using Task = ::Task;
::Scheduler scheduler;
inline bool execute(void) {
// “true” if it has called a task callback.
return !(TaskScheduler::scheduler.execute());
}
};