Gmt module: Add possibility for ParsePositionalParameters to parse only part of list.

modules/gmt/modgmt_param.h

@@ -128,7 +128,7 @@ class ParsePositionalParameters: public ParseParameters
 
  // Main parsing function
  template <class Par, class... Args>
- void Parse(ObjectList::IndexType i, const ObjectList* ol, Par& param, Args&... args)
+ void Parse(ObjectList::IndexType i, ObjectList::IndexType max, const ObjectList* ol, Par& param, Args&... args)
  {
   // Check types of arguments
   static_assert(std::is_same<PositionalParameter<typename Par::ConverterType, Par::optional>,Par>::value,"ParsePositionalParameters argument(s) must be PositionalParameter");
@@ -141,10 +141,10 @@ class ParsePositionalParameters: public ParseParameters
   }
 
   // List is ended
-  if(i>=ol->Size())
+  if(i>=max)
   {
    // Parameter is optional, skip it
-   if(Par::optional) Parse(i,ol,args...);
+   if(Par::optional) Parse(i,max,ol,args...);
    // Parameter is required, this is an error
    else err="Parameter "+param.Name()+" is required, but can't be setted because list is ended";
   }
@@ -153,22 +153,24 @@ class ParsePositionalParameters: public ParseParameters
   {
    bool res=param.Init(ol->At(i),err);
    // All Ok, continue to next element in list
-   if(res) Parse(i+1,ol,args...);
+   if(res) Parse(i+1,max,ol,args...);
    else
    {
     // All Ok, optional parameter may be absent, try to initialise next parameter by same list element
-    if(Par::optional) Parse(i,ol,args...);
+    if(Par::optional) Parse(i,max,ol,args...);
     // Error, required parameter not initialised
     else err="Can't initialise parameter "+param.Name()+" from list element number "+ToString(i)+": "+err;
    }
   }
  }
  // Bottom of recursion
- void Parse(ObjectList::IndexType i, const ObjectList* ol) {if(i<ol->Size()) err="There are excess elements in list";}
+ void Parse(ObjectList::IndexType i, ObjectList::IndexType max, const ObjectList* ol) {if(i<max) err="There are excess elements in list";}
 
  public:
- template <class... Args>
- ParsePositionalParameters(const ObjectList* ol, Args&... args) {Parse(0,ol,args...);}
+ template <class Converter, bool optional, class... Args>
+ ParsePositionalParameters(const ObjectList* ol, PositionalParameter<Converter,optional>& p1, Args&... args) {Parse(0,ol->Size(),ol,p1,args...);}
+ template <class Converter, bool optional, class... Args>
+ ParsePositionalParameters(const ObjectList* ol, ObjectList::IndexType min, ObjectList::IndexType max, PositionalParameter<Converter,optional>& p1, Args&... args) {Parse(min,std::min(max,ol->Size()),ol,p1,args...);}
 };