Mex/C++: reverted back to relying on RTO

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

zUtil_Cxx/include/DctMatlabData.h

@@ -56,7 +56,7 @@ namespace dct {
     static DctProjectionVector<Type, MatlabAllocator<Type> > create_collection_from_dims(const mxArray * const);
 
     template<typename Type>
-    static void import_coefficients(DctProjectionTransformCoefficients<Type> & out, const mxArray * const);
+    static DctProjectionTransformCoefficients<Type> import_coefficients(const mxArray * const);
     template<typename Type>
     static std::vector<DctProjectionTransformCoefficients<Type> > import_coefficients_list(const mxArray * const);
 
@@ -181,9 +181,11 @@ namespace dct {
   }
 
   template<typename Type>
-  void
-  DctMatlabData::import_coefficients(DctProjectionTransformCoefficients<Type> & output, const mxArray * const coeff)
+  DctProjectionTransformCoefficients<Type>
+  DctMatlabData::import_coefficients(const mxArray * const coeff)
   {
+    DctProjectionTransformCoefficients<Type> output;
+
     if (!mxIsStruct(coeff)) {
       throw WrongArgumentException("Invalid Coeffs: third argument should be a structure!");
     }
@@ -244,6 +246,8 @@ namespace dct {
 
     const double * const coeffs = (const double *) mxGetData(proj_coeffs_a);
     std::copy(coeffs, coeffs + num_elems, output.coeff.begin());
+
+    return output;
   }
 
   template<typename Type>
@@ -253,11 +257,11 @@ namespace dct {
     std::vector<DctProjectionTransformCoefficients<Type> > output;
 
     const mwSize num_coeff_structs = mxGetNumberOfElements(coeffs);
-    output.resize(num_coeff_structs);
+    output.reserve(num_coeff_structs);
 
     for (mwIndex num_struct = 0; num_struct < num_coeff_structs; num_struct++) {
       const mxArray * const coeff_cell = mxGetCell(coeffs, num_struct);
-      DctMatlabData::import_coefficients<Type>(output[num_struct], coeff_cell);
+      output.emplace_back(DctMatlabData::import_coefficients<Type>(coeff_cell));
     }
 
     return output;