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| code logs -> 2024 -> Wed, 17 Jan 2024 | < code.20240116.log - code.20240118.log > |
| --- Log opened Wed Jan 17 00:00:45 2024 |
| 00:03 | <@celticminstrel> | Is there no standard/Boost way to erase the type of a container in C++? Like, if I have a vector<int>, and I want a function to convert it to just a pair of iterators in a way that the code still compiles if I decide to change it to deque or list. |
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| 04:59 | <&McMartin> | celticminstrel: There is not, because the way C++ does Generics does not permit this to be a thing |
| 05:00 | <&McMartin> | C++ generics actually reimplement the entire class for each target type; it does not have a uniform generic reference the way Java does. |
| 05:00 | <&McMartin> | (To get Java-like behavior you implement a nontemplated void *-based version and make your templated class an extremely thin wrapper around it.) |
| 05:36 | <@celticminstrel> | All I really want is something equivalent to "unspecified iterator pointing to a T". |
| 05:38 | <@celticminstrel> | So that the container type doesn't need to be specified in the public API. |
| 05:40 | <&McMartin> | Yeah, that is just fundamentally not how the STL works |
| 05:40 | <&McMartin> | The closest you will get are that <algorithm> has stuff that takes two iterators for start and end and Does A Thing depending on what that function is |
| 05:40 | <@celticminstrel> | Boost.Range just wraps a pair of iterators, so that doesn't help either. |
| 05:40 | <&McMartin> | You're looking at writing a function that is itself templated and calls ++ or whatever to advance. |
| 05:41 | <&McMartin> | On the plus side, not only will that work on unspecified iterators, it will _also_ work on T* |
| 05:41 | <@celticminstrel> | Hmm… |
| 05:42 | <@celticminstrel> | I get the feeling this means making the virtual function(s) private/protected. |
| 05:42 | <&McMartin> | Virtuality is probably not the thing you want for this, yeah |
| 05:42 | <&McMartin> | Templated stuff -- and remember what the T in STL stands for -- are best thought of as lightly type-checked macros. |
| 05:43 | <@celticminstrel> | It's not even legal to make a template function virtual. |
| 05:47 | <&McMartin> | Yes; template functions do not properly exist until link time so it's impossible to fill out a vtable with them. |
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| --- Log closed Thu Jan 18 00:00:46 2024 |
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| code logs -> 2024 -> Wed, 17 Jan 2024 | < code.20240116.log - code.20240118.log > |
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