jtbandes

#include <iostream>
using namespace std;
template<int N, char C, char... Cs> struct repeatImpl : repeatImpl<N-1, C, C, Cs...> {};
template<char C, char... Cs> struct repeatImpl<0, C, Cs...> {
    static constexpr char cs[] = {Cs..., '\0'};
};
template<char C, char... Cs> constexpr char repeatImpl<0, C, Cs...>::cs[];

template<int N, char C> const char (& repeat())[N+1] {
    return repeatImpl<N, C>::cs;

jtbandes

A summary of compiler crashers still open as of 2017/2/9. Thanks to @slavapestov for further diagnosis on several of these.

Fixed!

By @rudkx in swiftlang/swift#7481:

• struct A{let d}A(_,print()) 28654-hastype-e-expected-type-to-have-been-set.swift

• A(_{}struct A{var f 28590-exprtypes-e-isequal-e-gettype-expected-type-in-map-to-be-the-same-type-in-expres.swift

jtbandes

#include <iostream>
#include <regex>


template<typename StringT>
struct regex_searcher_t {
    
    using IterT = decltype(std::begin(std::declval<const StringT&>()));
//    using CharT = typename std::decay<decltype(*std::declval<IterT>())>::type;
    using CharT = typename std::iterator_traits<IterT>::value_type;

jtbandes

func sequence<T>(_ initial: T, _ cond: (T) -> Bool, _ update: (inout T) -> ()) -> UnfoldSequence<T, T> {
  return sequence(state: initial, next: { (state: inout T) -> T? in
    guard cond(state) else { return nil }
    update(&state)
    return state
  })
}

for x in sequence(4, { $0 < 10 }, { $0 = $0 + 1 }) {
  print(x)

jtbandes

protocol P {
    var dynamicTypeAsMember: P.Type { get }
}
struct T: P {}

extension P {
    var dynamicTypeAsMember: P.Type {
        return self.dynamicType
    }
}

jtbandes

extension NSTimer
{
    private class Trampoline
    {
        typealias Handler = @convention(block) (NSTimer) -> Void
        
        @objc static func handleTimer(timer: NSTimer) {
            let handler = unsafeBitCast(timer.userInfo, Handler.self)
            handler(timer)
        }

jtbandes

x: Bool?	false	x==nil	x==false	x!=true	x==true, x??false	x!=false, x??true	x!=nil	true
true?	false	false	false	false	true	true	true	true
false?	false	false	true	true	false	false	true	true
nil	false	true	false	true	false	true	false	true

jtbandes

/// Decodes a dynamically-generated Uniform Type Identifier for inspection purposes. (**NOT FOR PRODUCTION USE!**)
/// Many, many thanks to http://alastairs-place.net/blog/2012/06/06/utis-are-better-than-you-think-and-heres-why/
///
/// <https://developer.apple.com/library/ios/documentation/FileManagement/Conceptual/understanding_utis/understand_utis_conc/understand_utis_conc.html#//apple_ref/doc/uid/TP40001319-CH202-BCGCDHIJ>
func decodeDynUTI(_ uti: String) -> String?
{
    let vec = Array("abcdefghkmnpqrstuvwxyz0123456789")

    let encoded = Array(uti).suffix(from: 5)
    var result: [UInt8] = []

jtbandes

import Control.Arrow ( (&&&) )
import qualified Control.Arrow ( first, second )
import Data.Maybe ( fromMaybe )

-- this also exists in Data.Graph.Inductive.Query.Monad
(><) :: (a -> c) -> (b -> d) -> (a, b) -> (c, d)
(><) f g = Control.Arrow.first f . Control.Arrow.second g

first :: [a] -> Maybe a
first [] = Nothing

jtbandes

var urlsToBlock = [
    // matches manifest.json
    "*://*.reddit.com/*"
];

function handleRequest(details) {
    return {cancel: true};
}

chrome.webRequest.onBeforeRequest.addListener(handleRequest, {"urls": urlsToBlock}, ["blocking"]);