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How much is too much with C++11 auto keyword?
...us to the reader what type auto represents.
Here are some examples:
auto foo = std::make_shared<Foo>(); // obvious
auto foo = bla(); // unclear. don't know which type `foo` has
const size_t max_size = 100;
for ( auto x = max_size; x > 0; --x ) // unclear. could lead...
Overloaded method selection based on the parameter's real type
...s used to determine the signature of the method to be called, in this case foo(Object). At runtime, the class of the object the method is called on determines which implementation of that method is called, taking into account that it may be an instance of a subclass of the declared type that overrid...
Aren't Python strings immutable? Then why does a + “ ” + b work?
...
The variable, a, which points to the string, is mutable.
Consider:
a = "Foo"
# a now points to "Foo"
b = a
# b points to the same "Foo" that a points to
a = a + a
# a points to the new string "FooFoo", but b still points to the old "Foo"
print a
print b
# Outputs:
# FooFoo
# Foo
# Observe that...
When should I use C++14 automatic return type deduction?
...n though there is a proposal to change this behaviour). Take for example a foobar function that will call a type's foo member function if it exists or call the type's bar member function if it exists, and assume that a class always has exacty foo or bar but neither both at once:
struct X
{
void...
Merge git repo into branch of another repo
Given repo Foo and repo Bar. I want to merge Bar with Foo, but only into a separate branch, called baz .
3 Answers
...
Static function variables in Swift
... class/struct. Try declaring a private struct with static variable.
func foo() -> Int {
struct Holder {
static var timesCalled = 0
}
Holder.timesCalled += 1
return Holder.timesCalled
}
7> foo()
$R0: Int = 1
8> foo()
$R1: Int = 2
9> foo()
$R2: Int = 3
...
Effects of the extern keyword on C functions
...
We have two files, foo.c and bar.c.
Here is foo.c
#include <stdio.h>
volatile unsigned int stop_now = 0;
extern void bar_function(void);
int main(void)
{
while (1) {
bar_function();
stop_now = 1;
}
return 0;
}
Now, h...
How to cherry-pick from a remote branch?
...
Adding remote repo (as "foo") from which we want to cherry-pick
$ git remote add foo git://github.com/foo/bar.git
Fetch their branches
$ git fetch foo
List their commits (this should list all commits in the fetched foo)
$ git log foo/master
...
How do I declare class-level properties in Objective-C?
...s equivalent to a static variable? E.g. only one instance for all types of Foo?
To declare class functions in Objective-C you use the + prefix instead of - so your implementation would look something like:
// Foo.h
@interface Foo {
}
+ (NSDictionary *)dictionary;
// Foo.m
+ (NSDictionary *)dicti...
What are the differences between type() and isinstance()?
...a common use-case for constructors). If you check for type like this:
def foo(data):
'''accepts a dict to construct something, string support in future'''
if type(data) is not dict:
# we're only going to test for dicts for now
raise ValueError('only dicts are supported for n...