OneList

Compact heterogeneous runtime list with compile-time type mirror for tiny embedded systems.

Designed for short menus (AM5), RPC/command systems, configuration, and generic zero-overhead programming in C++.

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Philosophy

• Tiny memory & stack footprint — ideal for AVR, ARM Cortex-M, ESP8266, etc.
• Strong compile-time introspection via ::Types
• Simple & military-sharp API
• Menu-first but general purpose

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Features

• Runtime heterogeneous list (List<...>)
• Compile-time TypeList mirror for rules, validation and HAPI integration
• Built-in Item<Id, Value> for RPC / menu actions
• withId() fast lookup (compile-time friendly)
• forEach, foldl
• Full constexpr support where possible
• No dynamic allocation

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Basic Usage

#include "oneList.h"

constexpr auto menu = staticBody(
    item("led",    []{ digitalWrite(13, !digitalRead(13)); }),
    item("status", "System OK"),
    item("reset",  []{ reboot(); }),
    item("temp",   23.5f)
);

// Runtime lookup by Id (great for RPC / buttons)
constexpr auto* action = menu.withId("led");
if (action) (*action)();

// Type-level introspection
using TL = decltype(menu)::Types;
static_assert(TL::Has<Item<const char*, float>>);
static_assert(TL::size == 4);