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Ticker with Delegate#6918

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Commits on Jun 28, 2021

• Delegate class template.

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• Solves problems with lambdas and std::bind

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• MSVC compiler picked up missing std::forward

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• Circular include issue fixed

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• Use function declaration syntax in template type specification

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• Use terse function notation - match std::function, the optional 1st argument for C-style FP is now ONLY in 3rd template argument.

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• Performance improvement for Delegate specialization without additional C-function ptr argument.

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• Updated Delegate and new MultiDelegate template.

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• MultiDelegate template argument to switch queue/event behavior.

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• Fix deletion of argument value caused by forwarding to Delegate.

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• Readied MultiDelegate for ESP32 ISR safeness.

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• Completed port of Delegate and MultiDelegate to Non-Arduino platforms

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• Add missing LGPL license header.

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• Directly derive from std::function for DelegateImpl<void, R>, too.

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• Fixed queue and event multiplexer modes (ISQUEUE template argument) for performance.

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• Signed-unsigned mismatch caught by ESP2866 Arduino CI.

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• Performance and ease of use, more comprehensible ctor and operator=: accept C-func ptr w/o

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• Interface full lockdown: mark implementation details private instead of protected.

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• For use of Delegate as callback in functions that take C-fun ptr and void* arg, added facility to type convert Delegate to R (*)(void*, P...) and function void* arg().

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• Optimize casting to fun ptr and argument for "attachInterruptArg"-like APIs.

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• Bug fix: must reinterpret_cast for R() as R(void*) cast (extra argument is harmless in C calling convention).

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• using operator= is required to suppress auto generation.

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• Delegate to fptr helpers must be in IRAM

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• Delegate refactoring for same ordering of member functions between specializations. Portability fix for Non-ESP Arduino.

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• Bug fix Delegate, custom type converter.

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• Use explicit initialization in ctor for kind member.

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• Fix ctor overloads competing with ctor templates.

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• Assignment operator template caused ambiguity error in MSVC build - drop it, it's strictly not necessary.

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• Delegate template programming for > 3 platforms is interesting.

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• unsigned/int instead of (u)int32_t gives lower memory footprint on 8bit devices.

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• Refactor uses of unsigned for buffer sizes and item counts to size_t.

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• It was found that internal linkage suppresses the effect of the IRAM_ATTR attribute.

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• std::bind is IRAM cache save, lambda is not.

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• Enhancements to MultiDelegate: event multiplexer mode no longer has auto-remove. Invoke returns result of last Delegate call.

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• Added forward iterator and begin() and end() functions to MultiDelegate.

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• Change to make MultiDelegate invoke and erase work off iterators.

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• Constness fix for iterator dereference

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• constness on return type warning fix.

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• Conform to C++ 17 and later.

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• Resolve g++ 9's c++17 deprecation warnings.

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• gcc 9.2 is very strict about template inheritance of ctor and assignment operators, needing a lot

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• Fix both ambiguous operator= and infinite ctor recursion.

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• don't cast to rvalue ref if also move'ing

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• Add assignment operators.

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• Example as performance test for Delegate vs. std::function

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• Revert "Add assignment operators."

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• Re-apply std::forwards and minor identifier rename.

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• More hints for proper use of Delegate to optimize performance.

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• Apply astyle

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• Added preprocessor define NODELEGATE. Use it for side-by-side comparison of Delegate<> vs. std::function<>

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• Field padding improved

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• Remove the now-deprecated ICACHE_RAM_ATTR.

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• Ticker ported to Delegate

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• std::bind is IRAM cache safe, but lambdas are not.

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Commits on Jun 29, 2021

• Review has proven that Ticker callbacks are documented to occur in SYS context, they are

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