Jason Rhinelander 423a49b8be array: add unchecked access via proxy object ... This adds bounds-unchecked access to arrays through a `a.unchecked<Type, Dimensions>()` method. (For `array_t<T>`, the `Type` template parameter is omitted). The mutable version (which requires the array have the `writeable` flag) is available as `a.mutable_unchecked<...>()`. Specifying the Dimensions as a template parameter allows storage of an std::array; having the strides and sizes stored that way (as opposed to storing a copy of the array's strides/shape pointers) allows the compiler to make significant optimizations of the shape() method that it can't make with a pointer; testing with nested loops of the form: for (size_t i0 = 0; i0 < r.shape(0); i0++) for (size_t i1 = 0; i1 < r.shape(1); i1++) ... r(i0, i1, ...) += 1; over a 10 million element array gives around a 25% speedup (versus using a pointer) for the 1D case, 33% for 2D, and runs more than twice as fast with a 5D array.		2017-03-22 16:13:59 -03:00
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pybind11	array: add unchecked access via proxy object	2017-03-22 16:13:59 -03:00