Top "Constraints" questions

A constraint is a condition that has to be fulfilled in a given context.

Solution for overloaded operator constraint in .NET generics

What would I do if I want to have a generic method that only accepts types that have overloaded an …

c# generics operator-overloading constraints
Constraint defined DEFERRABLE INITIALLY IMMEDIATE is still DEFERRED?

In connection with this answer I stumbled upon a phenomenon I cannot explain. Version: PostgreSQL 9.1.2 on x86_64-unknown-linux-gnu, compiled by …

sql postgresql constraints postgresql-9.1
Update SnapKit Constraint offset

I am using SnapKit and can't find a clean way to update the offset of a constraint. It's a simple …

ios swift constraints snapkit
Changing MySQL primary key when foreign key contraints exist

I have two already-existing tables which look (in part) roughly like this: CREATE TABLE parent ( old_pk CHAR(8) NOT NULL …

mysql foreign-keys primary-key constraints mysql-error-1025
Set UIImageView AspectRatio constraint programmatically in swift 3

I have an UIImageView in storyboard which AspectRatio is 1:1, that I want to change to 2:1 programmatically in ViewController in some …

ios swift3 constraints aspect-ratio
Postgres SQL Exclusive OR (XOR) CHECK CONSTRAINT, is it possible?

Is it possible to make a XOR CHECK CONSTRAINT? I'm doing it on a test table I just made that …

sql postgresql constraints xor
Information schema and Primary Keys

How do I just print out a 'primary key' for the column with the primary key? I get 'primary key' …

sql-server sql-server-2005 primary-key constraints information-schema
Why can't I use a type argument in a type parameter with multiple bounds?

So, I understand that the following doesn't work, but why doesn't it work? interface Adapter<E> {} class Adaptulator&…

java generics constraints
Launching Plugin Fails, Missing Constraint javax.xml.bind

I am writing an Eclipse plugin using Eclipse RCP (Kepler). Everything was working fine until last night all the sudden …

plugins eclipse-rcp constraints launching-application
How to Add Constraint for view inside stack view

I have one stack view that contains with 4 buttons. And each button I also add subview to that. The subview …

ios swift constraints uistackview