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CPPInsights thinks concepts aren't reducible to templates

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Bradlee Speice 2020-09-10 16:26:54 -04:00
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_posts/2020-08-05-static-polymorphism.md
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@ -12,7 +12,10 @@ useful because both languages are "system."
# System Differences
Worth noting differences in goals: polymorphism in C++ is only duck typing. Means that static
polymorphism happens separate from visibility, overloading, etc.
polymorphism happens separate from visibility, overloading, etc. Concepts appear to be more than an
extension of template metaprogramming
([example](https://cppinsights.io/lnk?code=I2luY2x1ZGUgPGNvbmNlcHRzPgojaW5jbHVkZSA8Y3N0ZGludD4KCnRlbXBsYXRlPHR5cGVuYW1lIFQ+CmNvbmNlcHQgSGFzTWV0aG9kID0gcmVxdWlyZXMgKFQgYSkgewogIHsgYS5tZXRob2QoKSB9IC0+IHN0ZDo6c2FtZV9hczxzdGQ6OnVpbnQ2NF90PjsKfTsKCmNsYXNzIE15Q2xhc3MgewpwdWJsaWM6CiAgc3RkOjp1aW50NjRfdCBtZXRob2QoKSB7CiAgICByZXR1cm4gMDsKICB9Cn07Cgp2b2lkIGZ1bmN0aW9uKEhhc01ldGhvZCBhdXRvIGEpIHsKICBhLm1ldGhvZCgpOwp9CgppbnQgbWFpbigpCnsKICBNeUNsYXNzIHh7fTsKICAKICBmdW5jdGlvbih4KTsKfQ==&insightsOptions=cpp2a&std=cpp2a&rev=1.0)),
but don't enable anything that wasn't possible otherwise (was just a monstrous pain previously).
Rust's trait system is more thorough (need a better way to explain that), which allows for trait
markers, auto-deriving, arbitrary self.