Using Range-Based For Loops with Char Pointer String

Question

I'm new to C++11, and quite frankly, I haven't used C++ in well over a year, so I'm a bit rusty to begin with. I'm doing some exercises from my old college text, and I've run into a problem while trying to iterate over a char pointer string (Ex: char * c = "a string";). I haven't been able to find anything helpful on Google. I'm so used to Java where the foreach loop can just iterate over any collection. I know how pointers work, but my long vacation from C++ has left me clueless about the syntax of actually using them. Can someone tell me why the following code (specifically, the convert() function) causes an error in compilation, in which it says "begin" and "end" were not declared in this scope? Ex12_01_RomanType.h ``` #ifndef EX12_01_ROMANTYPE_H #define EX12_01_ROMANTYPE_H class RomanType { public: RomanType(); RomanType(char * n); virtual ~RomanType(); char * toString(); int getValue(); private: char * numeral; int decimal; void convert(); }; #endif // EX12_01_ROMANTYPE_H ``` Ex1…

Accepted Answer

Range-based-`for` works on arrays, classes with member `begin` and `end`, or when there is an appropriate non-member `begin` and `end`.

You cant find the "end" of a `c`-style string (pointer to `NUL`-terminated `char` array) without walking all the way through it.

The simplest fix is just to use `std::string`, which will work with range-based-`for`.

(Edit: Now that I think of it, be careful even if you use a `char` array directly:

```
const char myString[] = "Hello";
for ( auto c : myString ) //...
```

because you will process all 6 members of the array, including the `NUL`-terminator. Although you can't do that here.)

Using Range-Based For Loops with Char Pointer String

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