Function dont_optimize_away

src/benchmarks/packed_vector.cpp:23–23

#ifdef _WIN32
#pragma optimize("", off)
template <class T> void dont_optimize_away(T &&datum) { T local = datum; }
#pragma optimize("", on)
#else
template <class T> void dont_optimize_away(T &&datum) { asm volatile("" : "+r"(datum)); }