Vector td iso free#

There's also a bewildering (literally) array of ancillary classes to use with valarray.

I suspect it's rather a chicken-and-egg sort of problem - without compiler support it didn't become popular, and as long as it's not popular, nobody's going to go to the trouble of working on their compiler to support it. In reality, however, I'm not at all sure that any real implementation takes advantage of this to any significant degree.

Vector td iso free#

Valarray is also supposed to eliminate any possibility of aliasing, which (at least theoretically) lets the compiler improve speed because it's more free to store values in registers. On most modern machines, what you'd generally prefer (to the extent possible) would be to load part of the array, do all the operations on it you're going to, then move on to the next part of the array. Unless you're dealing with fairly small arrays, however, that tends to work poorly with caching. It's an attempt at optimization, fairly specifically for the machines that were used for heavy-duty math when it was written - specifically, vector processors like the Crays.įor a vector processor, what you generally wanted to do was apply a single operation to an entire array, then apply the next operation to the entire array, and so on until you'd done everything you needed to do. Valarray is kind of an orphan that was born in the wrong place at the wrong time.