Add parameterization constructors taking tuples as arguments

* Fix name of parameter Alpha
* Add name of MvG parameterization

dune/dorie/solver/param_interface.hh

@@ -227,15 +227,11 @@ public:
             typename MvG::Tau tau{p_values.at(4)};
             typename RP::SaturatedConductivity k0{p_values.at(5)};
 
+            // can create parameters out of order by using tuple
             auto mvg =
                 std::make_shared<MualemVanGenuchtenParameterization<Traits>>
             (
-                theta_r,
-                theta_s,
-                k0,
-                alpha,
-                tau,
-                n
+                std::make_tuple(theta_s, theta_r, k0, alpha, tau, n)
             );
 
             ScalingType type = RP::Scaling::None;

dune/dorie/solver/param_mvg.hh

@@ -33,7 +33,7 @@ public:
     struct Alpha
     {
         RF value;
-        inline static const std::string name = "a";
+        inline static const std::string name = "alpha";
     };
 
     /// Parameter defining the value of n (retention curve shape)
@@ -54,7 +54,12 @@ public:
     Tau _tau;
     N _n;
 
-public: 
+    /// Name associated with this parameterization type
+    static inline std::string name = "MvG";
+
+public:
+
+    /// Construct from single parameters
     MualemVanGenuchtenParameterization (
         const ResidualWaterContent theta_r,
         const SaturatedWaterContent theta_s,
@@ -69,6 +74,15 @@ public:
         _n(n)
     { }
 
+    /// Construct from a tuple of parameters
+    template<typename... Args>
+    MualemVanGenuchtenParameterization (const std::tuple<Args...> parameters) :
+        RichardsParameterization<Traits>(parameters),
+        _alpha(std::get<Alpha>(parameters)),
+        _tau(std::get<Tau>(parameters)),
+        _n(std::get<N>(parameters))
+    { }
+
     /// Add default destructor to clarify override
     ~MualemVanGenuchtenParameterization () override = default;
 

dune/dorie/solver/param_richards.hh

@@ -85,6 +85,7 @@ public:
 
 public:
 
+    /// Construct from single parameters
     RichardsParameterization (
         const ResidualWaterContent theta_r,
         const SaturatedWaterContent theta_s,
@@ -95,6 +96,14 @@ public:
         _k0(k0)
     { }
 
+    /// Construct from a tuple of parameters
+    template<typename... Args>
+    RichardsParameterization (const std::tuple<Args...> parameters) :
+        _theta_r(std::get<ResidualWaterContent>(parameters)),
+        _theta_s(std::get<SaturatedWaterContent>(parameters)),
+        _k0(std::get<SaturatedConductivity>(parameters))
+    { }
+
     virtual ~RichardsParameterization () = default;
 
     /// Return a bound version of the water content function