rust


Can I determine the zero value of generic types?


The closest I managed to find was the std::num::Int and std::num::Float traits, which define zero(). However, they are specific to primitive types.
No, because it doesn't make sense in general. In fact, there are several types where "zero" is very specifically not valid at all. For example, if you were to take an appropriately-sized zero value and transmute it into a Box, that would violate memory safety!
There's an alternative to "zero", which is the Default trait. It allows you to say Default::default() to get a type's "default" value, whatever that happens to be. However, there's no consistent, sensible definition of "default" for all types. As such, you can only use it for types which explicitly implement it.

Related Links

How do I iterate over elements of a struct in Rust?
Do we need to manually create a destructor for a linked list?
Is it possible to create a macro to implement builder pattern methods?
Safely traversing a directed acyclic graph
Borrowing reference in structure
Is only using references the most idiomatic/efficient for “big” structures?
How to write a method that adds `self` as a mutable trait reference to a collection?
How do I modify a value after matching on it?
Drop a Rust void pointer stored in an FFI
Iterate two vectors and the rest of the larger one
How do I implement Clone/Copy for an enum that contains a String?
Modeling embedded hardware in Rust and how to have multiple mutable references cleanly?
Should I borrow or copy my small data types?
Using pointer casting to change the “type” of data in memory [duplicate]
Export function only to module test?
Take slice of certain length known at compile time

Categories

HOME
cocoapods
flask
orientdb
svn
eclipse-plugin
bokeh
magento-2.0
google-webmaster-tools
joomla3.2
yahoo
azure-graph-api
yeoman-generator-angular
fireloop
parsley.js
documentum
jodatime
asciimath
rpmbuild
word2vec
significance
infrared
node-webkit
pst
sybase-ase
perfino
dragula
spring-annotations
ninject
fatfs
unmarshalling
snap-framework
ms-media-foundation
adminer
bean-validation
xerces-c
netstat
forms-authentication
cartopy
cloudera-quickstart-vm
microkernel
word-cloud
robust
latexml
doctrine-extensions
dredd
intellij-lombok-plugin
swift2.3
.net-micro-framework
image-registration
md5-file
nivo-slider
stateless-session-bean
glassfish-4.1
google-shopping-api
finder
qtextedit
haraka
rational-performance-test
qtcpsocket
jtag
teamviewer
i2b2
seadragon
onepage-checkout
diawi
textpattern
variable-length-array
arbre
ruby-on-rails-4.1
openshift-cartridge
ora-04091
gql
google-gdk
artisan
com0com
comctl32
nesper
nachos
forceclose
spring-security-acl
vlab
postgres-xc
ax
apportable
objective-c-runtime
asp.net-mvc-3-areas
proc-open
cgrectmake
audiotoolbox
clearinterval
workflow-manager-1.x
jdom
prefuse
firebird1.5
wiktionary
play2-mini
office-automation
simile
explicit
3-tier
urchin
icon-language

Resources

Mobile Apps Dev
Database Users
javascript
java
csharp
php
android
MS Developer
developer works
python
ios
c
html
jquery
RDBMS discuss
Cloud Virtualization
Database Dev&Adm
javascript
java
csharp
php
python
android
jquery
ruby
ios
html
Mobile App
Mobile App
Mobile App