Hi, Bruno Lalande wrote:

Hi,

I'm having a hard time trying to use the find_format() function provided in the Algorithm/String library.

Sorry to hear that, I'll try to explain.

In the examples provided in the Concepts page, 2 examples of finder and formatter are provided: simple_finder and simple_formatter.

The first problem is a typing error in simple_finder that prevents it form compiling, I've opened a ticket to fix this (#1761).

Thanks for spotting that out.

The second problem is that simple_finder uses a function called make_range that I can't find anywhere in the Boost headers. What is this function? Am I supposed to write it myself?

It is called boost::make_iterator_range since it was moved to Boost.Range library. I missed this when I was updating the documentation. I'll correct it.

The third problem is that I can't find any example of actual use of those classes. I thought that this:

find_format(string("foobar"), simple_finder(), simple_formatter());

would compile and run (basically replacing the whole string by the same string), but after having tried to get rid of the second problem by de-templatizing the simple_finder to adapt it to string, it doesn't compile. But maybe I'm wrong in the way I did that:

struct simple_finder { template<typename ForwardIteratorT> boost::iterator_range<ForwardIteratorT> operator()( ForwardIteratorT Begin, ForwardIteratorT End ) { return string( Begin, End ); } };

This is not correct. A "finder" must return an iterator_range, not a string. It's purpose is to find a match in the input range (delimited by Begin and End iterators). As a result it should return a pair of iterators (in form of iterator_range) that belong to [Begin,End) range. make_iterator_range is actualy a simple wrapper over the contructor of the iterator_range. In the formatter you can replace it with iterator_range<ForwardIteratorT>(Begin, End); That should take care of finder. Formatter, on the other hand, can return anything, that can be inserted into the resulting string. So it might be std::string in your case. And finaly, I have spotted another problem in your call. You are trying to call find_format with the temporary string. Since find_format is a mutable algorithm, this approach will not work. You shoud use find_format_copy or pass a regular string variable. Best regards, Pavol