Tutorial by Topics: o

Transactions are protective blocks where SQL statements are only permanent if they can all succeed as one atomic action. The classic example is a transfer between two accounts where you can only have a deposit if the withdrawal succeeded and vice versa. Transactions enforce the integrity of the da...

infix [integer] ops infixl [integer] ops infixr [integer] ops Declaration componentMeaninginfixrthe operator is right-associativeinfixlthe operator is left-associativeinfixthe operator is non-associativeoptional digitbinding precedence of the operator (range 0...9, default 9)op1, ... , opn...

CTFE is a mechanism which allows the compiler to execute functions at compile time. There is no special set of the D language necessary to use this feature - whenever a function just depends on compile time known values the D compiler might decide to interpret it during compilation. You can also ...

for (<initializer>; <loop condition>; <loop statement>) { <statements> } while (<condition>) { <statements> } do { <statements> } while (<condition>); foreach (<el>, <collection>) foreach_reverse (<el>, <collection>) ...

What is the config system SilverStripe uses a global config system to store settings for classes and the application. These config variables can be used to define the structure of Models, security settings on Controllers or API keys for third party services. How it works Config values are p...

Programs written in C++ need to be compiled before they can be run. There is a large variety of compilers available depending on your operating system. Most operating systems ship without a compiler, and they have to be installed later. Some common compilers choices are: GCC, the GNU Compil...

Official Documentation: Detecting Common Gestures

IBOutlet is neither a reserved word nor a variable or class, is syntactic sugar for Interface Builder. After the Objective-C source code is pre-processed it is resolved to nothing. In Swift it's resolved as nil. It's declared in <UIKit/UINibDeclarations.h> as #ifndef IBOutlet #define IB...

contrast(<reference-color>, <output-for-light-refcolor>, <output-for-dark-refcolor>, <threshold>) lighten(<reference-color>, <amount>, <method>) darken(<reference-color>, <amount>, <method>) ParameterDetailsreference-colorThe colo...

Doze Mode is a set of changes and rules that put your phone to sleep when idle. On Android 6.0 Marshmallow: Doze mode gets activated after a while the screen is off, the device is stationary and it's running on battery. As you can see in the diagram above, when Doze Mode gets activated, the d...

Uses JSON file format Can also accept JavaScript style comments Overview The presence of a tsconfig.json file in a directory indicates that the directory is the root of a TypeScript project. The tsconfig.json file specifies the root files and the compiler options required to compile the...

API reference to the validation class can be found here: https://docs.phalconphp.com/en/latest/api/Phalcon_Validation.html If there is entity provided in \Phalcon\Validation you don't need to pass model key in \Phalcon\Validation\Validator\Uniqueness