[MPL] Description function phase/medium/comp/prop.

Used in error printing.

MaterialLib/MPL/Component.cpp

@@ -39,4 +39,9 @@ bool Component::hasProperty(PropertyType const& p) const
 {
     return properties_[p] != nullptr;
 }
+
+std::string Component::description() const
+{
+    return "component '" + name + "'";
+}
 }  // namespace MaterialPropertyLib

MaterialLib/MPL/Component.h

@@ -66,6 +66,9 @@ public:
                                                variable2);
     }
 
+    /// Short description of the component with its name.
+    std::string description() const;
+
 public:
     std::string const name;
 

MaterialLib/MPL/Medium.cpp

@@ -56,4 +56,9 @@ std::size_t Medium::numberOfPhases() const
 {
     return phases_.size();
 }
+
+std::string Medium::description() const
+{
+    return "medium";
+}
 }  // namespace MaterialPropertyLib

MaterialLib/MPL/Medium.h

@@ -47,6 +47,9 @@ public:
     /// consists of.
     std::size_t numberOfPhases() const;
 
+    /// Short description of the medium.
+    std::string description() const;
+
     template <typename T>
     T value(PropertyType const p) const
     {

MaterialLib/MPL/Phase.cpp

@@ -70,4 +70,8 @@ std::size_t Phase::numberOfComponents() const
     return components_.size();
 }
 
+std::string Phase::description() const
+{
+    return "phase '" + name + "'";
+}
 }  // namespace MaterialPropertyLib

MaterialLib/MPL/Phase.h

@@ -51,6 +51,9 @@ public:
     /// A get-function for retrieving the number of components in this phase.
     std::size_t numberOfComponents() const;
 
+    /// Short description of the phase with its name.
+    std::string description() const;
+
 public:
     std::string const name;
 

MaterialLib/MPL/Property.cpp

@@ -14,6 +14,10 @@
 
 #include <string>
 
+#include "Component.h"
+#include "Medium.h"
+#include "Phase.h"
+
 namespace MaterialPropertyLib
 {
 PropertyDataType fromVector(std::vector<double> const& values)
@@ -99,4 +103,12 @@ PropertyDataType Property::d2Value(VariableArray const& /*variable_array*/,
 {
     return 0.0;
 }
+
+std::string Property::description() const
+{
+    return "property '" + name_ + "' defined for " +
+           std::visit(
+               [](auto&& scale) -> std::string { return scale->description(); },
+               scale_);
+}
 }  // namespace MaterialPropertyLib

MaterialLib/MPL/Property.h

@@ -197,6 +197,7 @@ private:
         // Empty check for properties which can be defined on every scale,
         // medium, phase or component
     }
+    std::string description() const;
 
 private:
     /// Corresponds to the PropertyDataType