mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 03:33:50 +01:00
88 lines
3.3 KiB
C++
88 lines
3.3 KiB
C++
/*******************************************************************************
|
|
*
|
|
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
|
|
*
|
|
* Copyright (C) 2011-2013 by O. Parcollet
|
|
*
|
|
* TRIQS 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.
|
|
*
|
|
* TRIQS 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
|
|
* TRIQS. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
******************************************************************************/
|
|
#ifndef TRIQS_ARRAYS_FLAGS_H
|
|
#define TRIQS_ARRAYS_FLAGS_H
|
|
#include "../indexmaps/permutation.hpp"
|
|
namespace triqs { namespace arrays {
|
|
|
|
typedef unsigned long long ull_t;
|
|
|
|
namespace Tag {struct no_init {}; struct default_init {};}
|
|
|
|
// Flags is a 64 bit unsigned int.
|
|
// 0 is the default option.
|
|
// Meaning of the bits :
|
|
// 0 -> Const
|
|
// 1,2 -> Predefined order :
|
|
// 0 : None, 1 : C, 2 : Fortran
|
|
// 3 -> Init the array
|
|
// 5 -> Boundcheck
|
|
|
|
constexpr ull_t TraversalOrderC = 1ull << 1;
|
|
constexpr ull_t TraversalOrderFortran = 1ull << 2;
|
|
constexpr ull_t DefaultInit = 1ull << 3;
|
|
constexpr ull_t BoundCheck = 1ull << 5;
|
|
|
|
#define BOUND_CHECK triqs::arrays::BoundCheck
|
|
#define TRAVERSAL_ORDER_C triqs::arrays::TraversalOrderC
|
|
#define TRAVERSAL_ORDER_FORTRAN triqs::arrays::TraversalOrderFortran
|
|
#define DEFAULT_INIT triqs::arrays::DefaultInit
|
|
|
|
// NB : flags MUST be insensitive to slicing ...
|
|
// i.e. when I slice, the flags does not change.
|
|
|
|
namespace flags {
|
|
|
|
constexpr ull_t get(ull_t f, ull_t a) { return ((f & (1ull<<a)) >> a);}
|
|
constexpr ull_t get2(ull_t f, ull_t a) { return ((f & ((1ull<<a) + (1ull<< (a+1ull)))) >> a);}
|
|
|
|
#ifdef TRIQS_ARRAYS_ENFORCE_BOUNDCHECK
|
|
constexpr bool bound_check (ull_t f) { return true;}
|
|
#else
|
|
constexpr bool bound_check (ull_t f) { return get (f, 5)!=0;}
|
|
#endif
|
|
|
|
constexpr bool traversal_order_c (ull_t f) { return get (f,1ull)!=0ull;}
|
|
constexpr bool traversal_order_fortran (ull_t f) { return get (f,2ull)!=0ull;}
|
|
|
|
template< ull_t F> struct bound_check_trait { static constexpr bool value = bound_check(F); };
|
|
|
|
constexpr ull_t init_mode (ull_t f) { return get (f,3);}
|
|
|
|
template<ull_t F> struct init_tag1;
|
|
template<> struct init_tag1<0> { typedef Tag::no_init type;};
|
|
template<> struct init_tag1<1> { typedef Tag::default_init type;};
|
|
|
|
// for the init_tag, we pass the *whole* option flag.
|
|
template<ull_t F> struct init_tag : init_tag1 < init_mode(F)> {};
|
|
|
|
template<ull_t F, ull_t To> struct assert_make_sense {
|
|
static constexpr bool bc = bound_check(F);
|
|
static constexpr bool is_c = traversal_order_c(F);
|
|
static constexpr bool is_f = traversal_order_fortran(F);
|
|
static_assert ( (!( is_c && is_f)), "You asked C and Fortran traversal order at the same time...");
|
|
static_assert ( (!( (is_c || is_f) && To )), "You asked C or Fortran traversal order and gave a traversal order ...");
|
|
};
|
|
|
|
}
|
|
}}//namespace triqs::arrays
|
|
#endif
|