2022-01-15 GnuCash IRC logs
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06:11:11 <chris> what's the big issue about C++ templates? are they the C++ equivalent to lisp macros?
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07:56:56 <gnucashout> They're turing complete and a pain in the ass.
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08:53:57 <fell> gnucashout, perhaps you should ask on the user mailing list. See https://wiki.gnucash.org/wiki/Mailing_Lists#User_Lists
08:54:26 <fell> I never used QB.
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09:50:43 <chris> jralls: #1248 ready ...?
09:55:25 <chris> it still does some unwanted copying cpp objects around, which is unwanted. if the original PeriodDataVec was retrieved in #L522 then #L524 wouldn't be necessary.
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10:21:01 <Simon> like anything else in a language, if you use C++ templates sensibly then they're fine
10:22:22 <Simon> they're useful to avoid writing what would otherwise be duplicate code, like the standard containers
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10:44:20 <chris> c++ T = lisp macros then
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18:03:55 <jralls> chris, templates are for writing what's called generic code. std::vector is an example you've used. In the Standard Library it's a template. When you create e.g. a std::vector<std::string> the compiler uses the template code to create and compile a constructor for you. If you then call foo.push_back("bar") the compiler will use the std::vector::push_back() template to create a function that takes a std::string argument and inserts it at the end of
18:03:55 <jralls> the vector.
18:05:56 <jralls> I don't know enough about the guts of scheme macros to understand how they work, but Scheme is already loosely typed so there's less need for generics.
18:08:09 <jralls> As gnucashout said the template language is turing complete so you can also use templates to do work at compile time to compute a run-time constant. That's called "template metaprogramming".
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