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How can I remove a flag in C?
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+1 for catching the nonobvious corner case. One way to avoid it is to instead use flags -= flags & MY_FLAG; (or ^= if you prefer).
– R.. GitHub STOP HELPING ICE
Oct 16 '10 at 7:52
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About Python's built in sort() method
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled...
Java 8 functional interface with no arguments and no return value
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If I understand correctly you want a functional interface with a method void m(). In which case you can simply use a Runnable.
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Subset of rows containing NA (missing) values in a chosen column of a data frame
...NULL" strings as is).
If using read.table() or read.csv(), you should consider the "na.strings" argument to do clean data import, and always work with real R NA values.
An example, working in both cases "NULL" and "NA" cells :
DF <- read.csv("file.csv", na.strings=c("NA", "NULL"))
new_DF <-...
Multiple file upload in php
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HTML
create div with id='dvFile';
create a button;
onclick of that button calling function add_more()
JavaScript
function add_more() {
var txt = "<br><input type=\"file\" name=\"item_file[]\">";
document.getElementById("dvFil...
Type converting slices of interfaces
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In Go, there is a general rule that syntax should not hide complex/costly operations. Converting a string to an interface{} is done in O(1) time. Converting a []string to an interface{} is also done in O(1) time since a slice is still one value. However, converting a []string to ...
Rails migrations: self.up and self.down versus change
... rollback? It's not possible, so you need to define the down method.
As said, I suggest you to read the Rails Migrations Guide.
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Combining INSERT INTO and WITH/CTE
...AS (
bla bla
)
INSERT INTO dbo.prf_BatchItemAdditionalAPartyNos (
BatchID,
AccountNo,
APartyNo,
SourceRowID
)
SELECT * FROM tab
Please note that the code assumes that the CTE will return exactly four fields and that those fields are matching in order and type with those specified in the INSE...
How do I force git to checkout the master branch and remove carriage returns after I've normalized f
... This fails on git 1.8.3 (mac) with: error: pathspec 'HEAD^' did not match any file(s) known to git.
– dval
Oct 10 '14 at 14:39
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What is `params.require(:person).permit(:name, :age)` doing in Rails 4?
..., but it's actually an instance of ActionController::Parameters, which provides several methods such as require and permit.
The require method ensures that a specific parameter is present, and if it's not provided, the require method throws an error. It returns an instance of ActionController::Par...