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/* Ergo, version 3.8, a program for linear scaling electronic structure
* calculations.
* Copyright (C) 2019 Elias Rudberg, Emanuel H. Rubensson, Pawel Salek,
* and Anastasia Kruchinina.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Primary academic reference:
* Ergo: An open-source program for linear-scaling electronic structure
* calculations,
* Elias Rudberg, Emanuel H. Rubensson, Pawel Salek, and Anastasia
* Kruchinina,
* SoftwareX 7, 107 (2018),
* <http://dx.doi.org/10.1016/j.softx.2018.03.005>
*
* For further information about Ergo, see <http://www.ergoscf.org>.
*/
/** @file common.h
*
* @brief Macros for inlining and static assertions and structs for
* access to matrix elements specifying the layout of matrix entries
* in memory.
*
* @author Emanuel H. Rubensson
* @date 2009
*
*/
#ifndef COMMON_H
#define COMMON_H
#include <cassert>
#define ALWAYS_INLINE __attribute__((__always_inline__))
//#define ALWAYS_INLINE
//#define DEBUG_ON
/** Class template for use in static asserts.
*
*/
template<bool>
struct CompileTimeChecker {
CompileTimeChecker(...){}
};
/** Specialization of class template for use in static asserts.
*
*/
template<>
struct CompileTimeChecker<false> {
};
#define STATIC_ASSERT_ALWAYS(expr, msg) \
{ \
class ERROR_##msg {}; \
(CompileTimeChecker<(expr) != 0>(ERROR_##msg())); \
}
#ifdef DEBUG_ON
#define STATIC_ASSERT_DEBUG(expr, msg) STATIC_ASSERT_ALWAYS(expr, msg)
#else
#define STATIC_ASSERT_DEBUG(expr, msg)
#endif
// (void)sizeof(CompileTimeChecker<(expr) != 0>((ERROR_##msg()))); \
// Store leading dimension (template argument) as static const
// Then one can either use "get" function (ROWS, COLS args not needed?) or
// specialize templates depending on the type (transposed or regular).
/** Struct for access to matrix elements stored in row wise order.
* This struct used to specify how and in which order matrix elements are
* stored. At the moment, only regular row or column wise ordering is
* supported, but one could imagine symmetric or triangular storage.
* @see Ordering_col_wise
*/
struct Ordering_row_wise {
inline static int get( int const row, int const col,
int const rows, int const cols ) {
return row * cols + col;
}
template<int T_row, int T_col, int T_rows, int T_cols>
struct Get {
static int const index = T_row * T_cols + T_col;
};
};
/** Struct for access to matrix elements stored in column wise order.
* @see Ordering_row_wise
*/
struct Ordering_col_wise {
inline static int get( int const row, int const col,
int const rows, int const cols ) {
return row + col * rows;
}
template<int T_row, int T_col, int T_rows, int T_cols>
struct Get {
static int const index = T_row + T_col * T_rows;
};
};
#endif
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