boost/numeric/ublas/detail/duff.hpp
// // Copyright (c) 2000-2002 // Joerg Walter, Mathias Koch // // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // // The authors gratefully acknowledge the support of // GeNeSys mbH & Co. KG in producing this work. // #ifndef _BOOST_UBLAS_DUFF_ #define _BOOST_UBLAS_DUFF_ #define DD_SWITCH(n, d, r, expr) \ { \ unsigned r = ((n) + (d) - 1) / (d); \ switch ((n) % (d)) { \ case 0: do { expr; #define DD_CASE_I(i, expr) \ case (i): expr; #define DD_WHILE(r) \ } while (-- (r) > 0); \ } \ } #define DD_1T(n, d, r, expr) \ DD_WHILE(r) #define DD_2T(n, d, r, expr) \ DD_CASE_I(1, expr) \ DD_1T(n, d, r, expr) #define DD_3T(n, d, r, expr) \ DD_CASE_I(2, expr) \ DD_2T(n, d, r, expr) #define DD_4T(n, d, r, expr) \ DD_CASE_I(3, expr) \ DD_3T(n, d, r, expr) #define DD_5T(n, d, r, expr) \ DD_CASE_I(4, expr) \ DD_4T(n, d, r, expr) #define DD_6T(n, d, r, expr) \ DD_CASE_I(5, expr) \ DD_5T(n, d, r, expr) #define DD_7T(n, d, r, expr) \ DD_CASE_I(6, expr) \ DD_6T(n, d, r, expr) #define DD_8T(n, d, r, expr) \ DD_CASE_I(7, expr) \ DD_7T(n, d, r, expr) #define DD(n, d, r, expr) \ DD_SWITCH(n, d, r, expr) \ DD_##d##T(n, d, r, expr) #endif