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What is STRUCTURAL TYPE SYSTEM? What does STRUCTURAL TYPE SYSTEM mean?
What is STRUCTURAL TYPE SYSTEM? What does STRUCTURAL TYPE SYSTEM mean?
Published: 2017/10/06
Channel: The Audiopedia
Scala
Scala's Type System: a tutorial
Published: 2012/04/01
Channel: Ben Hutchison
Data Types C# - common language runtime types, nominal storage allocation, and value range
Data Types C# - common language runtime types, nominal storage allocation, and value range
Published: 2014/09/26
Channel: Damien Kettle
Types of Accounts : Personal Account, Real Account, Nominal Account
Types of Accounts : Personal Account, Real Account, Nominal Account
Published: 2015/12/21
Channel: Online Accounts Tuition Classes
Identifying Thread Pitch & Size
Identifying Thread Pitch & Size
Published: 2012/02/22
Channel: swagelok
Arthur from Electro-Voice, shows us the EVOLVE 50 Active DJ PA Speaker & App @ Getinthemix.com
Arthur from Electro-Voice, shows us the EVOLVE 50 Active DJ PA Speaker & App @ Getinthemix.com
Published: 2017/09/25
Channel: GetInTheMix
Types of Variables
Types of Variables
Published: 2010/07/06
Channel: statslectures
Floating vs. Fixed Exchange Rates- Macroeconomics 5.4
Floating vs. Fixed Exchange Rates- Macroeconomics 5.4
Published: 2014/11/11
Channel: ACDCLeadership
Nominal Roll 2018 - Export And Merge
Nominal Roll 2018 - Export And Merge
Published: 2017/09/14
Channel: Sathiya Seelan
Tolerancing Basics: Calculating a Fit between and Cylinder and a Hole
Tolerancing Basics: Calculating a Fit between and Cylinder and a Hole
Published: 2014/05/24
Channel: Technical Drawing 101 with AutoCAD Channel
all systems nominal 18 01 2014 001
all systems nominal 18 01 2014 001
Published: 2014/01/23
Channel: ☢☢☢ ReaL Canadian Democracy.Net
Macroeconomics: Crash Course Economics #5
Macroeconomics: Crash Course Economics #5
Published: 2015/08/24
Channel: CrashCourse
All Systems Nominal
All Systems Nominal
Published: 2012/06/20
Channel: MechinVideos
5  End effector configuration + Nominal configuration
5 End effector configuration + Nominal configuration
Published: 2014/11/14
Channel: ARCASProject
Type-Z.E.R.O. - All Systems Nominal
Type-Z.E.R.O. - All Systems Nominal
Published: 2013/02/03
Channel: Eric Normandin
Timothy Jones - Brand Objects for Nominal Typing - ECOOP 2015
Timothy Jones - Brand Objects for Nominal Typing - ECOOP 2015
Published: 2015/08/17
Channel: ECOOP !
Structure Types
Structure Types
Published: 2014/08/30
Channel: Uq Architecture
Logoster Plays: Systems Nominal
Logoster Plays: Systems Nominal
Published: 2014/12/24
Channel: TheGamingChannel
Systems Nominal: I Cant Type!
Systems Nominal: I Cant Type!
Published: 2014/12/23
Channel: DeathAngelGaming
Real GDP and nominal GDP | GDP: Measuring national income | Macroeconomics | Khan Academy
Real GDP and nominal GDP | GDP: Measuring national income | Macroeconomics | Khan Academy
Published: 2012/02/10
Channel: Khan Academy
All systems nominal
All systems nominal
Published: 2016/05/08
Channel: Mikey Key
RMU fuse operating trip mechanism
RMU fuse operating trip mechanism
Published: 2015/12/13
Channel: RODALCO2007
British Plugs Are Better Than All Other Plugs, And Here
British Plugs Are Better Than All Other Plugs, And Here's Why
Published: 2014/07/07
Channel: Tom Scott
Type-ZERO - All Systems Nominal (MechWarrior Online Tribute)
Type-ZERO - All Systems Nominal (MechWarrior Online Tribute)
Published: 2013/01/02
Channel: Eric Normandin
Systems Nominal (Anything But)
Systems Nominal (Anything But)
Published: 2014/12/24
Channel: Kyoto-Moto
SPSS for questionnaire analysis:  Correlation analysis
SPSS for questionnaire analysis: Correlation analysis
Published: 2013/12/24
Channel: Phil Chan
All Systems Nominal: CW Chapter 2
All Systems Nominal: CW Chapter 2
Published: 2015/04/15
Channel: NoGutsNoGalaxyTV
Enter data and define variables in SPSS
Enter data and define variables in SPSS
Published: 2013/08/12
Channel: BrunelASK
Vater Nicht - All Systems Nominal
Vater Nicht - All Systems Nominal
Published: 2013/07/24
Channel: Vater Nicht
What Is Personal Real And Nominal Account?
What Is Personal Real And Nominal Account?
Published: 2017/06/20
Channel: smART X-mas
All Systems Nominal: Episode #3 - Equilibrium
All Systems Nominal: Episode #3 - Equilibrium
Published: 2013/03/31
Channel: NoGutsNoGalaxyTV
Day 02, Video 03 Part 1 Core C# - More About Data Types
Day 02, Video 03 Part 1 Core C# - More About Data Types
Published: 2010/12/09
Channel: Bob Tabor
All Systems Nominal: Episode #6 - Retroactive
All Systems Nominal: Episode #6 - Retroactive
Published: 2014/11/04
Channel: NoGutsNoGalaxyTV
First Normal Form | Database Management System
First Normal Form | Database Management System
Published: 2014/09/30
Channel: Techtud
subrange
subrange
Published: 2012/11/22
Channel: Leigh Quince
All Systems Nominal: Phase 3 Teaser
All Systems Nominal: Phase 3 Teaser
Published: 2016/06/25
Channel: PLEXI
I Play Nerd Cubed
I Play Nerd Cubed's New Game Systems Nominal
Published: 2014/12/24
Channel: Darkthoughts
What Is Personal Real And Nominal Account?
What Is Personal Real And Nominal Account?
Published: 2017/08/16
Channel: Liam Liam
Types of bank account
Types of bank account
Published: 2016/12/13
Channel: DeltaStep
All systems nominal
All systems nominal
Published: 2013/09/28
Channel: ShooterXGR
L5/P1: GDP Calculation Methods, CSO Base-revision, Economic Survey Data
L5/P1: GDP Calculation Methods, CSO Base-revision, Economic Survey Data
Published: 2015/03/14
Channel: Mrunal Patel
Rolls-Royce | Permanent Magnet Technology
Rolls-Royce | Permanent Magnet Technology
Published: 2016/09/02
Channel: Rolls-Royce
Lec-14 Excitation Systems-Part-1
Lec-14 Excitation Systems-Part-1
Published: 2010/10/29
Channel: nptelhrd
[MWO] All Systems Nominal
[MWO] All Systems Nominal
Published: 2012/11/09
Channel: John Garren
All Systems Nominal
All Systems Nominal
Published: 2013/03/31
Channel: Arch
A Video about Variable Levels: Nominal, Ordinal, Interval, & Ratio
A Video about Variable Levels: Nominal, Ordinal, Interval, & Ratio
Published: 2013/03/29
Channel: JGRTeachingVideos
What are
What are 'nominal damages' in a civil claim?
Published: 2016/08/26
Channel: Ehline Law Firm Personal Injury Attorneys, APLC
Electronic compact starter Episode 4: Setting the nominal current HF range
Electronic compact starter Episode 4: Setting the nominal current HF range
Published: 2017/01/26
Channel: ABB Low voltage products
SAMSUNG Brand New 2016 DVM-S (VRF) 30HP ~ Redefining System A/C Standards [by ESE]
SAMSUNG Brand New 2016 DVM-S (VRF) 30HP ~ Redefining System A/C Standards [by ESE]
Published: 2015/11/21
Channel: ESE SAMSUNG
Journal Entry for [24 Transactions] Simple explanations :-by kauserwise
Journal Entry for [24 Transactions] Simple explanations :-by kauserwise
Published: 2015/05/30
Channel: Kauser Wise
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WIKIPEDIA ARTICLE

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In computer science, a nominal or nominative type system (or name-based type system) is a major class of type system, in which compatibility and equivalence of data types is determined by explicit declarations and/or the name of the types. Nominal systems are used to determine if types are equivalent, as well as if a type is a subtype of another. It contrasts with structural systems, where comparisons are based on the structure of the types in question and do not require explicit declarations.

Nominal typing[edit]

Nominal typing means that two variables are type-compatible if and only if their declarations name the same type. For example, in C, two struct types with different names in the same translation unit are never considered compatible, even if they have identical field declarations.

However, C also allows a typedef declaration, which introduces an alias for an existing type. These are merely syntactical and do not differentiate the type from its alias for the purpose of type checking. This feature, present in many languages, can result in a loss of type safety when (for example) the same primitive integer type is used in two semantically distinct ways. Haskell provides the C-style syntactic alias in the form of the type declaration, as well as the newtype declaration that does introduce a new, distinct type, isomorphic to an existing type.[1]

Nominal subtyping[edit]

In a similar fashion, nominal subtyping means that one type is a subtype of another if and only if it is explicitly declared to be so in its definition. Nominally-typed languages typically enforce the requirement that declared subtypes be structurally compatible (though Eiffel allows non-compatible subtypes to be declared). However, subtypes which are structurally compatible "by accident", but not declared as subtypes, are not considered to be subtypes.

C++, C#, Java, Objective-C, Delphi, Swift, and Rust all primarily use both nominal typing and nominal subtyping.

Some nominally-subtyped languages, such as Java and C#, allow classes to be declared final (or sealed in C# terminology), indicating that no further subtyping is permitted.

Comparison[edit]

Nominal typing is useful at preventing accidental type equivalence, which allows better type-safety than structural typing. The cost is a reduced flexibility, as, for example, nominal typing does not allow new super-types to be created without modification of the existing subtypes.

See also[edit]

Notes[edit]

References[edit]

External links[edit]

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