more readable code, better testcase

brainfuck/brainfuck.hpp

@@ -12,13 +12,18 @@ namespace brainfuck_details {
 // recursive funtion (from http://www.xs4all.nl/~weegen/eelis/geordi/) but templated
 template <typename T, typename InputIterator, typename OutputIterator>
 void b(char * c, InputIterator& in, T * & p, OutputIterator out){
-        for(; *c&&*c!=']'; ++c) {
-                (*((p+=*c=='>')-=*c=='<')+=*c=='+') -=*c=='-';
-                if(*c=='.') *out++ = *p;
-                if(*c==',') *p = *in++;
-                if(*c=='[') {
-                        for(++c; *p;)b(c,in,p,out);
-                        for(int d=0; *c!=']'||d--; ++c)d+=*c=='[';
+        for(; *c && *c != ']'; ++c) {
+		switch(*c){
+			case '>' : ++p; break;
+			case '<' : --p; break;
+			case '+' : ++*p; break;
+			case '-' : --*p; break;
+			case '.' : *out++ = *p; break;
+			case ',' : *p = *in++; break;
+			case '[' :
+                        	for(++c; *p;) b(c, in, p, out);
+                        	for(int d = 0; *c!=']' || d--; ++c) if(*c == '[') d++;
+				break;
                 }   
         } 
 }

brainfuck/main.cpp

@@ -4,8 +4,11 @@
 #include "brainfuck.hpp"
 
 int main() {
-	brainfuck<int>("+[,.]", std::istream_iterator<int>(std::cin));
-	brainfuck<int>(">++++++++++++++++++++++++++++++++>+>+[[+++++[>++++++++<-]>.<++++++[>--------<-]+<<<]>.>>[[-]<[>+<-]>>[<<+>+>-]<[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>[-]>+>+<<<-[>+<-]]]]]]]]]]]+>>>]<<<]");
+	// will print "Hello World", or something like that.
+	brainfuck("++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.");
+
+	// will print the fibonacci sequence
+	brainfuck(">++++++++++++++++++++++++++++++++>+>+[[+++++[>++++++++<-]>.<++++++[>--------<-]+<<<]>.>>[[-]<[>+<-]>>[<<+>+>-]<[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>+<-[>[-]>+>+<<<-[>+<-]]]]]]]]]]]+>>>]<<<]");
 	
 	return 0;
 }