== Quote from Paulo Pinto (pj...@progtools.org)'s article > Hi, > while reading TDPL I start wondering what is the background between function > and delegate. > They seem to provide more or less the same funcionality, except delegate > allows the capture > of the function declaration environment. > Most of the programming languages with support for closures only have one > way of doing it. > Why is D providing two ways of doing it? For me sounds like a feature > similar to register, or > inline for doing what should be the compilers work. Deciding the best > implementation for the > closure. > Thanks, > Paulo
Yes, it's ugly but in a systems language you need control over details like whether a context pointer is present in addition to the function pointer. Anyhow, one thing that people always seem to fail to notice is that std.functional has a toDelegate() function that can convert just about any function pointer into a delegate with minimal overhead. This mitigates the situation a lot, since if an API requires a delegate and you have a function pointer, you just do a toDelegate(someFunctionPointer).
