patrickt

A Quick and Dirty Lens primer

Why does Lens exist? Well, Haskell records suck, for a number of reasons. I will enumerate them using this sample record.

data User = User { login    :: Text
                 , password :: ByteString
                 , email    :: Text
                 , created  :: UTCTime
 }

stuartjmoore

- (void)loadOrResizeOrSometing {
    /*
     *  After creating the text view or resizing the font, set the quoteWidth and contentInset.
     */
    WPTextContainer *textContainer = (WPTextContainer*)paragraphView.textContainer;
    textContainer.spaceWidth = [self widthForCharacter:@" "];
    textContainer.charWidths = @{
                                 @(8220) : @([self widthForCharacter:@"“"]),
                                 @(8216) : @([self widthForCharacter:@"‘"]),
                                 @('"')  : @([self widthForCharacter:@"\""]),

skyscribe

#                                                                                                        
#   STL GDB evaluators/views/utilities - 1.03
#
#   The new GDB commands:                                                         
# 	    are entirely non instrumental                                             
# 	    do not depend on any "inline"(s) - e.g. size(), [], etc
#       are extremely tolerant to debugger settings
#                                                                                 
#   This file should be "included" in .gdbinit as following:
#   source stl-views.gdb or just paste it into your .gdbinit file

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD