Re: [boost] boost::aligned_storage broken on VC12 for alignment values of 8

On 30/03/14 08:41, Glen Fernandes wrote:

Very surprising, but easily reproducible with VC12 (2013), Release or Debug configuration, Win32 platform: the following program will often* throw:

#include #include <cstdint> int main() { boost::aligned_storage<8, 8>::type a; if (((std::uintptr_t)&a % 8) != 0) { throw 1; } }

* Four of every five times it failed because the storage was only 4-byte aligned, not 8-byte aligned.

Does not reproduce for x64 builds, just x86 builds. Does not reproduce with alignment values other than 8.

AFAIK, with Windows 32-bit, you cannot reliably have an object with alignment greater than 4 on the stack. Use dynamic memory allocation.