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Scala
Scala's Type System: a tutorial
Published: 2012/04/01
Channel: Ben Hutchison
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
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
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
What Is The Meaning Of Nominal Account?
What Is The Meaning Of Nominal Account?
Published: 2017/12/05
Channel: Charles Lutz
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
subrange
subrange
Published: 2012/11/22
Channel: Leigh Quince
All Systems Nominal: CW Chapter 2
All Systems Nominal: CW Chapter 2
Published: 2015/04/15
Channel: NoGutsNoGalaxyTV
Identifying Thread Pitch & Size
Identifying Thread Pitch & Size
Published: 2012/02/22
Channel: swagelok
Sampling: Simple Random, Convenience, systematic, cluster, stratified - Statistics Help
Sampling: Simple Random, Convenience, systematic, cluster, stratified - Statistics Help
Published: 2012/03/14
Channel: Statistics Learning Centre
Medium Transmission Line
Medium Transmission Line
Published: 2017/08/12
Channel: Smile and Learn
Classification of Accounts | Accounting | LetsTute Accountancy
Classification of Accounts | Accounting | LetsTute Accountancy
Published: 2015/07/02
Channel: Letstute Accountancy
What Is The Difference Between Real And Nominal Accounts?
What Is The Difference Between Real And Nominal Accounts?
Published: 2017/12/04
Channel: Charles Lutz
Types of Variables
Types of Variables
Published: 2010/07/06
Channel: statslectures
Money supply: M0, M1, and M2 | The monetary system | Macroeconomics | Khan Academy
Money supply: M0, M1, and M2 | The monetary system | Macroeconomics | Khan Academy
Published: 2012/03/23
Channel: Khan Academy
What Is Personal Real And Nominal Account?
What Is Personal Real And Nominal Account?
Published: 2017/12/04
Channel: Charles Lutz
What are
What are 'nominal damages' in a civil claim?
Published: 2016/08/26
Channel: Ehline Law Firm Personal Injury Attorneys, APLC
EMSEAL BEJS Installation - Bridge Expansion Joint System
EMSEAL BEJS Installation - Bridge Expansion Joint System
Published: 2013/06/20
Channel: EMSEAL Joint Systems, Ltd.
SPSS for questionnaire analysis:  Correlation analysis
SPSS for questionnaire analysis: Correlation analysis
Published: 2013/12/24
Channel: Phil Chan
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
All Systems Nominal: Episode #6 - Retroactive
All Systems Nominal: Episode #6 - Retroactive
Published: 2014/11/04
Channel: NoGutsNoGalaxyTV
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
Type-ZERO - All Systems Nominal (MechWarrior Online Tribute)
Type-ZERO - All Systems Nominal (MechWarrior Online Tribute)
Published: 2013/01/02
Channel: Type ZERO
What Is Personal Real And Nominal Account?
What Is Personal Real And Nominal Account?
Published: 2017/06/20
Channel: smART X-mas
Vater Nicht - All Systems Nominal
Vater Nicht - All Systems Nominal
Published: 2013/07/24
Channel: Vater Nicht
All Systems Nominal: Episode #3 - Equilibrium
All Systems Nominal: Episode #3 - Equilibrium
Published: 2013/03/31
Channel: NoGutsNoGalaxyTV
systems nominal new hack 2015
systems nominal new hack 2015
Published: 2014/12/23
Channel: doobyplease
What Is The Difference Between Real And Nominal Accounts?
What Is The Difference Between Real And Nominal Accounts?
Published: 2017/11/22
Channel: Tedfri Teff
Nominal pie model of medium Transmission line
Nominal pie model of medium Transmission line
Published: 2017/10/15
Channel: unique dictionary
First Normal Form | Database Management System
First Normal Form | Database Management System
Published: 2014/09/30
Channel: Techtud
Enter data and define variables in SPSS
Enter data and define variables in SPSS
Published: 2013/08/12
Channel: BrunelASK
Macroeconomics: Crash Course Economics #5
Macroeconomics: Crash Course Economics #5
Published: 2015/08/24
Channel: CrashCourse
What Is Personal Real And Nominal Account?
What Is Personal Real And Nominal Account?
Published: 2017/11/22
Channel: Sityui Spun
What Is The Difference Between Nominal And Real Accounts?
What Is The Difference Between Nominal And Real Accounts?
Published: 2017/12/04
Channel: Charles Lutz
What Is An Example Of A Nominal Account?
What Is An Example Of A Nominal Account?
Published: 2017/12/04
Channel: Charles Lutz
Monetary and fiscal policy | Aggregate demand and aggregate supply | Macroeconomics | Khan Academy
Monetary and fiscal policy | Aggregate demand and aggregate supply | Macroeconomics | Khan Academy
Published: 2012/03/07
Channel: Khan Academy
5  End effector configuration + Nominal configuration
5 End effector configuration + Nominal configuration
Published: 2014/11/14
Channel: ARCASProject
What Is Personal Real And Nominal Account?
What Is Personal Real And Nominal Account?
Published: 2017/08/16
Channel: Liam Liam
Intro to Programming - Part 2: Data Types
Intro to Programming - Part 2: Data Types
Published: 2013/10/02
Channel: antiprotons
All systems nominal
All systems nominal
Published: 2013/09/28
Channel: ShooterXGR
SPSS Questionnaire/Survey Data Entry - Part 1
SPSS Questionnaire/Survey Data Entry - Part 1
Published: 2014/04/21
Channel: Quantitative Specialists
Class 12 macroeconomics( Foreign exchange rate) economics on your tips video 72
Class 12 macroeconomics( Foreign exchange rate) economics on your tips video 72
Published: 2016/11/04
Channel: Economics on your tips
Rolls-Royce | Permanent Magnet Technology
Rolls-Royce | Permanent Magnet Technology
Published: 2016/09/02
Channel: Rolls-Royce
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
Is Sales Account A Nominal Account?
Is Sales Account A Nominal Account?
Published: 2017/12/04
Channel: Declan Everett
Systems Nominal (Anything But)
Systems Nominal (Anything But)
Published: 2014/12/24
Channel: Kyoto-Moto
Calculating tonnage of your air conditioner
Calculating tonnage of your air conditioner
Published: 2012/04/24
Channel: crazyjdkid
All Systems Nominal
All Systems Nominal
Published: 2013/03/31
Channel: Arch
All Systems Nominal
All Systems Nominal
Published: 2012/06/20
Channel: MechinVideos
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
  (Redirected from Nominative type system)
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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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