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RHistUtils.hxx
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1/// \file ROOT/RHistUtils.hxx
2/// \ingroup HistV7
3/// \author Axel Naumann <axel@cern.ch>
4/// \date 2016-06-01
5/// \warning This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback is welcome!
6
7/*************************************************************************
8 * Copyright (C) 1995-2016, Rene Brun and Fons Rademakers. *
9 * All rights reserved. *
10 * *
11 * For the licensing terms see $ROOTSYS/LICENSE. *
12 * For the list of contributors see $ROOTSYS/README/CREDITS. *
13 *************************************************************************/
14
15#ifndef ROOT7_RHistUtils
16#define ROOT7_RHistUtils
17
18#include <array>
19#include <type_traits>
20
21namespace ROOT {
22namespace Experimental {
23
24class RLogChannel;
25/// Log channel for Hist diagnostics.
26RLogChannel &HistLog(); // implemented in RAxis.cxx
27
28namespace Hist {
29
30template <int DIMENSIONS>
31struct RCoordArray: std::array<double, DIMENSIONS> {
32 using Base_t = std::array<double, DIMENSIONS>;
33
34 /// Default construction.
35 RCoordArray() = default;
36
37 /// Construction with one `double` per `DIMENSION`.
38 template<class...ELEMENTS, class = typename std::enable_if<sizeof...(ELEMENTS) + 1 == DIMENSIONS>::type>
39 RCoordArray(double x, ELEMENTS...el): Base_t{{x, el...}} {}
40
41 /// Fallback constructor, invoked if the one above fails because of the wrong number of
42 /// arguments / coordinates.
43 template<class T, class...ELEMENTS, class = typename std::enable_if<sizeof...(ELEMENTS) + 1 != DIMENSIONS>::type>
44 RCoordArray(T, ELEMENTS...) {
45 static_assert(sizeof...(ELEMENTS) + 1 == DIMENSIONS, "Number of coordinates does not match DIMENSIONS");
46 }
47
48 /// Construction from a C-style array.
49 RCoordArray(double (&arr)[DIMENSIONS]): Base_t(arr) {}
50
51 /// Copy-construction from a C++-style array.
52 /// (No need for a move-constructor, it isn't any better for doubles)
53 RCoordArray(const std::array<double, DIMENSIONS>& arr): Base_t(arr) {}
54};
55
56template <int DIMENSIONS>
57//using CoordArray_t = std::array<double, DIMENSIONS>;
59
60
61} // namespace Hist
62} // namespace Experimental
63} // namespace ROOT
64
65#endif //ROOT7_THistUtils_h
int type
Definition TGX11.cxx:121
Double_t x[n]
Definition legend1.C:17
RLogChannel & HistLog()
Log channel for Hist diagnostics.
Definition RAxis.cxx:25
tbb::task_arena is an alias of tbb::interface7::task_arena, which doesn't allow to forward declare tb...
RCoordArray(double x, ELEMENTS...el)
Construction with one double per DIMENSION.
RCoordArray(T, ELEMENTS...)
Fallback constructor, invoked if the one above fails because of the wrong number of arguments / coord...
RCoordArray(const std::array< double, DIMENSIONS > &arr)
Copy-construction from a C++-style array.
std::array< double, DIMENSIONS > Base_t
RCoordArray(double(&arr)[DIMENSIONS])
Construction from a C-style array.
RCoordArray()=default
Default construction.