[Cpp] Implement array fill assignments

This prevents temporary arrays with all equal elements.
Also fix the assignment of bool(ean) arrays in CodegenCpp.tpl.

Belonging to [master]:
  - OpenModelica/OMCompiler#2792
  - OpenModelica/OpenModelica-testsuite#1078

Compiler/Template/CodegenCpp.tpl

@@ -10989,19 +10989,22 @@ case eqn as SES_ARRAY_CALL_ASSIGN(lhs=lhs as CREF(__)) then
       'localData->helpVars[<%hidx%>] && !localData->helpVars_saved[<%hidx%>] /* edge */'
     ;separator=" || ")C*/, &varDecls /*BUFD*/,simCode , &extraFuncs , &extraFuncsDecl,  extraFuncsNamespace, stateDerVectorName, useFlatArrayNotation)
   match expTypeFromExpShort(eqn.exp)
-  case "boolean"
+  case "bool"
   case "int" then
+    let lhsStr = cref1(lhs.componentRef, simCode, &extraFuncs, &extraFuncsDecl, extraFuncsNamespace, context, varDeclsCref, stateDerVectorName, useFlatArrayNotation)
     <<
     <%if not assignToStartValues then '<%startFixedExp%>'%>
     <%preExp%>
-    <%cref1(lhs.componentRef,simCode , &extraFuncs , &extraFuncsDecl,  extraFuncsNamespace, context, varDeclsCref, stateDerVectorName, useFlatArrayNotation)%>=<%expPart%>;
+    <%lhsStr%>.assign(<%expPart%>);
     >>
   case "double" then
     <<
     <%if not assignToStartValues then '<%startFixedExp%>'%>
     <%preExp%>
     <%assignDerArray(context, expPart, lhs, simCode, &extraFuncs, &extraFuncsDecl, extraFuncsNamespace, stateDerVectorName, useFlatArrayNotation)%>
     >>
+  else
+    error(sourceInfo(), 'Unsupported type of array call assign: <%expTypeFromExpShort(eqn.exp)%>')
 end equationArrayCallAssign;
 
 template assignDerArray(Context context, String arr, Exp lhs_ecr, SimCode simCode, Text& extraFuncs, Text& extraFuncsDecl, Text extraFuncsNamespace, Text stateDerVectorName /*=__zDot*/, Boolean useFlatArrayNotation)

SimulationRuntime/cpp/Include/Core/Math/Array.h

@@ -88,9 +88,9 @@ template<typename T> class BaseArray
   virtual T& operator()(const vector<size_t>& idx) = 0;
   virtual void assign(const T* data) = 0;
   virtual void assign(const BaseArray<T>& b) = 0;
+  virtual void assign(const T& value) = 0; // fill value
   virtual std::vector<size_t> getDims() const = 0;
   virtual int getDim(size_t dim) const = 0; // { (int)getDims()[dim - 1]; }
-
   virtual size_t getNumElems() const = 0;
   virtual size_t getNumDims() const = 0;
   virtual void setDims(const std::vector<size_t>& v) = 0;
@@ -271,6 +271,17 @@ class RefArray : public BaseArray<T>
                      _ref_array, CopyCArray2RefArray<T>());
   }
 
+  /**
+   * Assigns value reference to each array element
+   * @param value  new value for each element
+   * a.assign(value)
+   */
+  virtual void assign(const T& value)
+  {
+    for (size_t i = 0; i < nelems; i++)
+      *_ref_array[i] = value;
+  }
+
   /**
    * Access to data (read-only)
    */
@@ -757,6 +768,20 @@ class StatArray : public BaseArray<T>
     }
   }
 
+  /**
+   * Assigns value to each array element
+   * @param value  new array value
+   * a.assign(value)
+   */
+  virtual void assign(const T& value)
+  {
+    if (nelems > 0) {
+      if (_data == NULL)
+        throw std::runtime_error("Cannot assign value to uninitialized StatArray!");
+      std::fill(_data, _data + nelems, value);
+    }
+  }
+
   /**
    * Access to data
    */
@@ -1397,6 +1422,12 @@ class DynArray : public BaseArray<T>
       std::copy(data, data + _nelems, _array_data);
   }
 
+  virtual void assign(const T& value)
+  {
+    if (_nelems > 0)
+      std::fill(_array_data, _array_data + _nelems, value);
+  }
+
   virtual void resize(const std::vector<size_t>& dims)
   {
     if (dims.size() != ndims)

SimulationRuntime/cpp/Include/Core/Math/ArraySlice.h

@@ -176,6 +176,11 @@ class ArraySliceConst: public BaseArray<T> {
                                   "Can't assign array to ArraySliceConst");
   }
 
+  virtual void assign(const T& value) {
+    throw ModelicaSimulationError(MODEL_ARRAY_FUNCTION,
+                                  "Can't assign value to ArraySliceConst");
+  }
+
   virtual std::vector<size_t> getDims() const {
     return _dims;
   }
@@ -340,6 +345,10 @@ class ArraySlice: public ArraySliceConst<T> {
     setDataDim(_idxs.size(), otherArray.getData());
   }
 
+  virtual void assign(const T& value) {
+    setEachDim(_idxs.size(), value);
+  }
+
   virtual T& operator()(size_t i) {
     return _baseArray(ArraySliceConst<T>::baseIdx(1, &i));
   }
@@ -390,5 +399,25 @@ class ArraySlice: public ArraySliceConst<T> {
     }
     return processed;
   }
+
+  /**
+   * recursive method for muli-dimensional fill of each element
+   */
+  void setEachDim(size_t dim, const T& value) {
+    const BaseArray<int> *iset = ArraySliceConst<T>::_isets[dim - 1];
+    size_t size = iset? iset->getNumElems(): _idxs[dim - 1].size();
+    if (size == 0)
+      size = _baseArray.getDim(dim);
+    for (size_t i = 1; i <= size; i++) {
+      if (iset)
+        _baseIdx[dim - 1] = iset->getNumElems() > 0? (*iset)(i): i;
+      else
+        _baseIdx[dim - 1] = _idxs[dim - 1].size() > 0? _idxs[dim - 1][i - 1]: i;
+      if (dim > 1)
+        setEachDim(dim - 1, value);
+      else
+        _baseArray(_baseIdx) = value;
+    }
+  }
 };
 /** @} */ // end of math