Add method to create a default Peak/LeanElasticPeak for the workspace

Framework/API/inc/MantidAPI/IPeaksWorkspace.h

@@ -134,6 +134,12 @@ public:
   virtual std::unique_ptr<Geometry::IPeak>
   createPeakHKL(const Mantid::Kernel::V3D &HKL) const = 0;
 
+  /**
+   * Create an instance of a peak using default constructor
+   * @return a pointer to a new Peak object.
+   */
+  virtual std::unique_ptr<Geometry::IPeak> createPeak() const = 0;
+
   //---------------------------------------------------------------------------------------------
   /** Determine if the workspace has been integrated using a peaks integration
    * algorithm.

Framework/DataObjects/inc/MantidDataObjects/LeanElasticPeaksWorkspace.h

@@ -106,6 +106,8 @@ public:
   std::unique_ptr<Geometry::IPeak>
   createPeakHKL(const Kernel::V3D &HKL) const override;
 
+  std::unique_ptr<Geometry::IPeak> createPeak() const override;
+
   int peakInfoNumber(const Kernel::V3D &qFrame, bool labCoords) const override;
 
   std::vector<LeanElasticPeak> &getPeaks();

Framework/DataObjects/inc/MantidDataObjects/PeaksWorkspace.h

@@ -104,6 +104,8 @@ public:
   std::unique_ptr<Geometry::IPeak>
   createPeakHKL(const Kernel::V3D &HKL) const override;
 
+  std::unique_ptr<Geometry::IPeak> createPeak() const override;
+
   int peakInfoNumber(const Kernel::V3D &qFrame, bool labCoords) const override;
 
   std::vector<Peak> &getPeaks();

Framework/DataObjects/src/LeanElasticPeaksWorkspace.cpp

@@ -327,6 +327,15 @@ LeanElasticPeaksWorkspace::createPeakHKL(const V3D &HKL) const {
   return peak;
 }
 
+/**
+ * Create a Peak using default values
+ *
+ * @return a point to a new peak object
+ */
+std::unique_ptr<IPeak> LeanElasticPeaksWorkspace::createPeak() const {
+  return std::make_unique<LeanElasticPeak>();
+}
+
 /**
  * Returns selected information for a "peak" at QLabFrame.
  *

Framework/DataObjects/src/PeaksWorkspace.cpp

@@ -509,6 +509,15 @@ std::unique_ptr<IPeak> PeaksWorkspace::createPeakHKL(const V3D &HKL) const {
   return peak;
 }
 
+/**
+ * Create a Peak using default values
+ *
+ * @return a point to a new peak object
+ */
+std::unique_ptr<IPeak> PeaksWorkspace::createPeak() const {
+  return std::make_unique<Peak>();
+}
+
 /**
  * Returns selected information for a "peak" at QLabFrame.
  *