Vector to Array
summary
Shows how C++20 constexpr std::vector lets a multi-pass algorithm that previously produced a heap-allocated vector become a compile-time constant copied into a std::array, using template parameters to extract the size and contents. Applies to porting a real-time guitar cabinet emulator from a Raspberry Pi to a Pico with 512 KB RAM, eliminating runtime allocations and fitting static buffers. Adds a generic invocable auto lambda variant to accept any constexpr range. Tested with a Pico-capable compiler and it works.
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