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What is the purpose of the reader monad?
...Closure = (Term, Env)
When we are done, we should get out a value (or an error):
data Value = Lam String Closure | Failure String
So, let's write the interpreter:
interp' :: Term -> Reader Env Value
--when we have a lambda term, we can just return it
interp' (Lambda nv t)
= do env <-...
How do I print a list of “Build Settings” in Xcode project?
... YES
GCC_THUMB_SUPPORT YES
GCC_TREAT_WARNINGS_AS_ERRORS NO
GCC_VERSION com.apple.compilers.llvm.clang.1_0
GCC_VERSION_IDENTIFIER com_apple_compilers_llvm_clang_1_0
GCC_WARN_ABOUT_RETURN_TYPE YE...
Why is a round-trip conversion via a string not safe for a double?
... - Mul64 will be called
// at most twice during the conversion, so the error won't propagate
// to any of the 53 significant bits of the result
unsigned long long val = Mul32x32To64(a >> 32, b >> 32) +
(Mul32x32To64(a >> 32, b) >> 32) +
(Mul32x32To...
What is the combinatory logic equivalent of intuitionistic type theory?
...(Show, Functor)
infixl 4 :$
data Ze
magic :: Ze -> a
magic x = x `seq` error "Tragic!"
data Su a = Ze | Su a deriving (Show, Functor, Eq)
I use a de Bruijn index representation in the Bellegarde and Hook manner (as popularised by Bird and Paterson). The type Su a has one more element than a, ...
Difference between GIT and CVS
...ut inconveniencing other users. In particular if you notice typo (or other error) in commit message, or a bug in commit, you can simply use "git commit --amend". This is not possible (at least not without heavy hackery) in CVS.
More tools. Git offers much more tools than CVS. One of more important i...
Git-Based Source Control in the Enterprise: Suggested Tools and Practices?
...e integrated into everyone's working copies. This merging very painful and error-prone.
– Sad Developer
Mar 12 '10 at 11:37
...
Getting the closest string match
...
Thanks. I edited out the error. The reason I started by describing the fixed-length array was because it's easy to understand. Suffix arrays and BWT are a bit harder to grasp, but actually we do sometimes want to use an index with different values of...
Separation of business logic and data access in django
... if User.objects.get(pk=user_id).active:
raise ValidationError("This user cannot be activated")
# you can also check authorizations etc.
return user_id
def execute(self):
"""
This is not a standard method in the forms API; it is intended to rep...
RESTful Authentication
...d response. If you don't like it, just send a 403 Forbidden instead. The error page may include a method to login or a link to it. However, but biggest argument against cookies AND http authentication (regardless of whether the state is server side or client side) is that they are vulnerable to c...
What does .SD stand for in data.table in R
...he heterogeneity in this relationship as follows (noting that the standard errors from this approach are generally incorrect -- the specification ERA ~ W*teamID will be better -- this approach is easier to read and the coefficients are OK):
# use the .N > 20 filter to exclude teams with few obse...