Sounds useful - if only to some people. Paul -- Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB Phone and SMS text +44 1539 561830, Mobile and SMS text +44 7714 330204 mailto: pbristow@hetp.u-net.com http://www.hetp.u-net.com/index.html http://www.hetp.u-net.com/Paul%20A%20Bristow%20info.html | -----Original Message----- | From: boost-bounces@lists.boost.org | [mailto:boost-bounces@lists.boost.org] On Behalf Of Michael Tegtmeyer | Sent: 27 January 2006 19:40 | To: boost@lists.boost.org | Subject: [boost] Interest in static-sized valarray | | Hello, | | I am trying to guage interest in a fixed sized version of valarray. I | frequently found myself using small(-ish) compile-time known sized | numeric arrays that don't justify the overhead of operator new in | std::valarray but needed the math interface that valarray provided. I | wrote a static-sized version of valarray for this purpose. It | is modeled | after std::valarray and implements about 90% of valarray's interface | (obviously resizing is not included, neither is gslice due to | the result | not being known at compile time). Examples of it's use are: | | float _v[10] = {...}; | size_t _i[5] = {...}; | | cvalarray<float,10> v1(_v); | cvalarray<float,5> v2 = v1[cslice<0,5,2>()]; | v1[cslice<0,3,3>()] = 0.0f; | | cvalarray<size_t,5> ind(_i); | cvalarray<float,5> cvalB = v1[ind]; | | v2 *= (v2 + v1) / 2.0; | //all of the usual math ops | | I have a complete implementation that models std::valarray in every | possible way (with compile-time known limitations) including | expression-template support for the numeric ops. My testing | indicates a | decent performance increase over gcc4's valarray for small number of | elements <1000. | | If anyone has any interest, I'll put together some docs and | throw it in | the sandbox. | | Mike Tegtmeyer | | _______________________________________________ | Unsubscribe & other changes: | http://lists.boost.org/mailman/listinfo.cgi/boost |