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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...
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 to import CSV file data into a PostgreSQL table?
How can I write a stored procedure that imports data from a CSV file and populates the table?
18 Answers
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How do I get around type erasure on Scala? Or, why can't I get the type parameter of my collections?
It's a sad fact of life on Scala that if you instantiate a List[Int], you can verify that your instance is a List, and you can verify that any individual element of it is an Int, but not that it is a List[Int], as can be easily verified:
...
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 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...
Rails: convert UTC DateTime to another time zone
In Ruby/Rails, how do I convert a UTC DateTime to another time zone?
6 Answers
6
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How are echo and print different in PHP? [duplicate]
...e to use print() only for situations like:
echo 'Doing some stuff... ';
foo() and print("ok.\n") or print("error: " . getError() . ".\n");
share
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improve this answer
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f...
What does enumerable mean?
...}
A for..in loop then iterates through the object's property names.
var foo = { bar: 1, baz: 2};
for (var prop in foo)
console.log(prop); // outputs 'bar' and 'baz'
But, only evaluates its statement – console.log(prop); in this case – for those properties whose [[Enumerable]] attribute...
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...