Re: How multiprecision optimizes allocation?

From: John Maddock (jz.maddock_at_[hidden])
Date: 2019-11-05 11:33:08

On 05/11/2019 09:12, Andy via Boost-users wrote:
> sizeof(boost::multiprecision::cpp_int) is only 24 bytes = 6*32 bit limb
> This means, that upto 24 bytes is stored at stack on variable itself, 
> and bigger are allocated?

There are other member variables making up that size - the default (as 
used by type cpp_int) is never less than 2 whole limbs (so 128 bits when 
__int128 is available), otherwise however many limbs will fit inside 
sizeof(unsigned)+sizeof(void*), which is 4 32-bit limbs on MSVC.

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