v2: ndslice API rework, extern(C++) support (#143)

* v2: ndslice API rework

* update combinatorics

* uncomment code

* clean Slice

* fix example

* minor cleanup

* clean code

* move mir.ndslice.algorithm -> mir.algorithm.iteration

* add cpp_example

* fix docs

* update example

* comment out DMD

appveyor.yml

@@ -1,12 +1,12 @@
 platform: x64
 environment:
  matrix:
-  - DC: dmd
-    DVersion: 2.080.0
-    arch: x64
-  - DC: dmd
-    DVersion: 2.080.0
-    arch: x86
+  # - DC: dmd
+  #   DVersion: 2.080.0
+  #   arch: x64
+  # - DC: dmd
+  #   DVersion: 2.080.0
+  #   arch: x86
   - DC: ldc
     DVersion: '1.9.0'
     arch: x64

cpp_example/eye.d

@@ -0,0 +1,26 @@
+module eye;
+
+import mir.ndslice;
+
+extern(C++, Space)
+{
+    Slice!(double*, 2) eye(size_t n) nothrow @nogc
+    {
+        auto ret = stdcUninitSlice!double(n, n);
+        ret[] = 0;
+        ret.diagonal[] = 1;
+        return ret;
+    }
+
+    void printMatrix(Slice!(double*, 2) matrix)
+    {
+        import core.stdc.stdio;
+
+        foreach(row; matrix)
+        {
+            foreach(e; row)
+                printf("%f ", e);
+            printf("\n");
+        }
+    }
+}

cpp_example/main.cpp

@@ -0,0 +1,16 @@
+#include <cstdlib>
+#include "mir/ndslice.h"
+
+namespace Space
+{
+    mir_slice<double*, 2> eye(size_t n);
+    void printMatrix(mir_slice<double*, 2> matrix);
+}
+
+int main()
+{
+    mir_slice<double*, 2> matrix = Space::eye(3);
+    Space::printMatrix(matrix);
+    std::free(matrix._iterator);
+    return 0;
+}

cpp_example/run.sh

@@ -0,0 +1,3 @@
+ldmd2 -betterC -O -inline -release eye.d -I../source -c
+g++ main.cpp eye.o -std=c++11 -I../include
+./a.out

doc/Makefile

@@ -38,7 +38,7 @@ PACKAGE_mir_internal = utility
 PACKAGE_mir_interpolate = package constant linear spline pchip utility
 PACKAGE_mir_math = constant common sum numeric package
 PACKAGE_mir_math_func = expdigamma
-PACKAGE_mir_ndslice_connect = cpp cpython
+PACKAGE_mir_ndslice_connect = cpython
 
 PACKAGE_mir_ndslice = \
 	algorithm\

include/mir/ndslice.h

@@ -0,0 +1,31 @@
+/**
+ ************ Mir-Algorithm ************
+
+The module provides wrappers for $(SUBREF slice, Slice) that
+can be used as arguments for C++ functions.
+
+License:   $(HTTP boost.org/LICENSE_1_0.txt, Boost License 1.0).
+Copyright: Copyright © 2017-, Ilya Yaroshenko
+Authors:   Ilya Yaroshenko
+*/
+#include <cstddef>
+
+// It is out of ndslice namespace because of a DMD mangling bug.
+enum class mir_slice_kind : int
+{
+    universal = 0,
+    canonical = 1,
+    contiguous = 2
+};
+
+template <
+    typename Iterator,
+    size_t N = 1,
+    mir_slice_kind kind = mir_slice_kind::contiguous
+>
+struct mir_slice
+{
+    size_t _lengths[N];
+    ptrdiff_t _strides[kind == mir_slice_kind::universal ? N : kind == mir_slice_kind::canonical ? N - 1 : 0];
+    Iterator _iterator;
+};

include/mir/series.h

@@ -0,0 +1,23 @@
+#include "mir/ndslice.h"
+
+template  <
+    typename Index,
+    typename Data
+>
+struct mir_observation
+{
+    Index _index;
+    Data _data;
+}
+
+template <
+    typename IndexIterator,
+    typename Iterator,
+    size_t N = 1,
+    mir_slice_kind kind = mir_slice_kind::contiguous
+>
+struct mir_series
+{
+    mir_slice<Iterator, N, kind> _data;
+    IndexIterator _index;
+};