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When does invoking a member function on a null instance result in undefined behavior?
...a) and (b) result in undefined behavior. It's always undefined behavior to m>ca m>ll a member function through a null pointer. If the function is static, it's technim>ca m>lly undefined as well, but there's some dispute.
The first thing to understand is why it's undefined behavior to dereference a null poi...
How do you pass arguments to define_method?
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The block that you pass to define_method m>ca m>n include some parameters. That's how your defined method accepts arguments. When you define a method you're really just nicknaming the block and keeping a reference to it in the class. The parameters come with the block...
Applying a git post-commit hook to all current and future repos
...shared folder accessible by all devs, for them to reference in their own lom>ca m>l config.
– VonC
Nov 11 '16 at 15:47
unfo...
git shallow clone (clone --depth) misses remote branches
...on_codegen
Shallow clones
Due to the shallow-description in the technim>ca m>l documentation, a "git-clone --depth 20 repo [...] result[s in] commit chains with a length of at most 20." A shallow clone therefore should contain the requested depth of commits, from the tip of a branch.
As - in additi...
Using multiple let-as within a if-statement in Swift
...'m unwrapping two values from a dictionary and before using them I have to m>ca m>st them and test for the right type. This is what I m>ca m>me up with:
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Sprintf equivalent in Java
Printf got added to Java with the 1.5 release but I m>ca m>n't seem to find how to send the output to a string rather than a file (which is what sprintf does in C). Does anyone know how to do this?
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Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
...at issues DDL. I would like to know whether CREATE TABLE and similar DDL m>ca m>n be rolled back in
5 Answers
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Depend on a branch or tag using a git URL in a package.json?
...lt;project>.git#feature\/<branch>
As of NPM version 1.1.65, you m>ca m>n do this:
<user>/<project>#<branch>
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Difference between Destroy and Delete
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Basim>ca m>lly destroy runs any m>ca m>llbacks on the model while delete doesn't.
From the Rails API:
ActiveRecord::Persistence.delete
Deletes the record in the database and freezes this instance to reflect that no changes should be...
Converting an array of objects to ActiveRecord::Relation
I have an array of objects, let's m>ca m>ll it an Indim>ca m>tor . I want to run Indim>ca m>tor class methods (those of the def self.subjects variety, scopes, etc) on this array. The only way I know to run class methods on a group of objects is to have them be an ActiveRecord::Relation. So I end up resorting to...