Changes in src/helpers.hpp [36166d:d9f51c]

File:

• src/helpers.hpp (modified) (1 diff)

src/helpers.hpp

@@ -194 +194 @@
 };
 
+/************ struct to contain simple enumerations ***************/
+template <class C>
+struct enumeration{
+  enumeration() : max(0) {}
+  enumeration(unsigned int i) : max(i) {}
+  enumeration(const enumeration &src) :
+    there(src.there),
+    back(src.back),
+    max(src.max)
+  {}
+  enumeration &operator=(const enumeration &src){
+    /* no self-assignment check needed */
+    there = src.there;
+    back = src.back;
+    max = src.max;
+    return *this;
+  }
+  void add(const C &value){
+    if(!there.count(value)){
+      there[value]=max;
+      back[max++]=value;
+    }
+  }
+  unsigned int getMax() const{
+    return max;
+  }
+
+  map<C,unsigned int> there;
+  map<unsigned int,C> back;
+private:
+  unsigned int max;
+};
+
+/***** A counter to generate sequential numbers *******************/
+struct counter{
+  inline counter() : count(0){};
+  inline counter(int i) : count(i){};
+  inline unsigned int operator()(){
+    return count++;
+  }
+private:
+  unsigned int count;
+};
+
+template <class C,class ForwardIterator>
+enumeration<C> enumerate(ForwardIterator first,ForwardIterator last){
+  enumeration<C> res;
+  for_each(first,last,bind1st(mem_fun(&enumeration<C>::add),&res));
+  return res;
+}
+
 #endif /*HELPERS_HPP_*/