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c++ – Iterating over std::map in PHP with SWIG

Posted by: admin July 12, 2020 Leave a comment

Questions:

I am using SWIG to wrap a function that returns an std::map in PHP.

In the PHP code, I need to iterate over the elements of the map.

Thw SWIG library provides support for std::map with the std_map.i interface file, but only the following methods are wrapped:

 clear()
 del($key)
 get($key)
 has_key($key)
 is_empty()
 set($key, $x)
 size()

How can I iterate over the elements of the map? Would I need to extend the std_map.i file with some sort of wrappers for iterators and begin() and end()?

How to&Answers:

As @awoodland said you will have to implement the iterator interface.

Here is another question on stackoverflow. Although it is java it can give you a better idea of what you are looking for:

No iterator for Java when using SWIG with C++'s std::map