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Subject: Re: [boost] [pool] Definition of a static_pool ?
From: Christopher Kormanyos (e_float_at_[hidden])
Date: 2012-04-28 15:16:17

>> Because I never figured out a way to *place* an array at >> the known physical address in memory where I want it, >> such as 0xFFE0, or whatever the address of, say, the >> ADC result registers may be in the microcontroller. >> Maybe there is a simpler way to do things like this. >> But I never got it. Any advice would be welcome. > What about placement new? > Or an array_ref (not part of Boost). > Olaf Sorry, I was unclear. I meant that I never figured out how to put std::array at an address of my choice. Unfortunately, I have written countless custom arrays and custom allocators, etc. for this, constantly making and re-making the same mistakes over and over again. I generally use 3 methods for memory-mapped arrays. The methods 2 and 3 are related to Etienne's OP. But since I was wrong about the scope of Boost.Pool in the first place, it might be able to do it and I just don't know. 1) In C and C++ if I don't need size(), begin(), end(), etc., I use something like this #define adc_results ((volatile uint16_t*) 0xFFE0) 2) If I need size(), begin(), end() and also want to give the compiler freedom for loop unrolling, I use something like this template<typename address_type, const address_type addr, const unsigned N> class memory_mapped_array {   // And basically write most of std::array, but without data,   // only using the (volatile) address   ... }; 3) If I really need the comfort of a container, I use something like this in combination with an STL container. template<typename address_type, const address_type addr> class memory_mapped_allocator {   // And basically write std::allocator conforming allocator   // but at a volatile address. }; I keep writing methods 2 and 3 over and over again, probably never really getting it right. I thought if Etienne wants to extend Boost.Pool, others might want memory-mapped pools and allocators. But we're getting too far off the OP. Thanks and best regards, Chris.

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