Having formerly been one of “those people”, I don’t know that there’s a succinct way to sum up why pattern-matching is such tasty goodness. It’s experiential. Back when I had just glanced at pattern-matching and thought it was a glorified switch statement, I think that I didn’t have experience programming with algebraic data types (tuples … Read more
I am curious as to how F# performance compares to C++ performance? Varies wildly depending upon the application. If you are making extensive use of sophisticated data structures in a multi-threaded program then F# is likely to be a big win. If most of your time is spent in tight numerical loops mutating arrays then … Read more
Applicatives are great when you’ve got a plain old function of several variables, and you have the arguments but they’re wrapped up in some kind of context. For instance, you have the plain old concatenate function (++) but you want to apply it to 2 strings which were acquired through I/O. Then the fact that … Read more
Simply List.choose id as in > [Some 4; None; Some 2; None] |> List.choose id;; val it : int list = [4; 2] List.choose id
This is easy once you realize that Object-Oriented Constructor Injection corresponds very closely to Functional Partial Function Application. First, I’d write Dings as a record type: type Dings = { Lol : string; Rofl : string } In F#, the IGetStuff interface can be reduced to a single function with the signature Guid -> seq<Dings> … Read more
The inline keyword indicates that a function definition should be inserted inline into any code which uses it. Most of the time, this will not have any effect on the type of the function. However, in rare cases, it can lead to a function which has a more general type, since there are constraints which … Read more
Below is a working example of calling F# from C#. As you encountered, I was not able to add a reference by selecting from the “Add Reference … Projects” tab. Instead I did have to do it manually, by browsing to the F# assembly in the “Add Reference … Browse” tab. —— F# MODULE —– … Read more
What order are the files in the .fsproj file? Stack.fs needs to come before Program.fs for Program.fs to be able to ‘see’ it. See also the start of http://lorgonblog.spaces.live.com/blog/cns!701679AD17B6D310!444.entry and the end of http://lorgonblog.spaces.live.com/blog/cns!701679AD17B6D310!347.entry
And for the full proof of concept here is a fully capable translation of Rasmus’ approach to JIT into F# open System open System.Runtime.InteropServices type AllocationType = | COMMIT=0x1000u type MemoryProtection = | EXECUTE_READWRITE=0x40u type FreeType = | DECOMMIT = 0x4000u [<DllImport(“kernel32.dll”, SetLastError=true)>] extern IntPtr VirtualAlloc(IntPtr lpAddress, UIntPtr dwSize, AllocationType flAllocationType, MemoryProtection flProtect); [<DllImport(“kernel32.dll”, SetLastError=true)>] … Read more
YOu should put the bytes into the before sending and using BufferStream INput output