# Singleton types vs. instances as type parameters

**URL:** <https://discourse.julialang.org/t/singleton-types-vs-instances-as-type-parameters/2802>\
**Category:** General Usage\
**Created:** [March 21, 2017, 6:28pm UTC](https://discourse.julialang.org/t/singleton-types-vs-instances-as-type-parameters/2802 "2017-03-21T18:28:56Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![mkborregaard](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mkborregaard/32/556_2.png) [@mkborregaard](https://discourse.julialang.org/u/mkborregaard)\
**Post date:** [March 21, 2017, 8:00pm UTC](https://discourse.julialang.org/t/singleton-types-vs-instances-as-type-parameters/2802/4 "2017-03-21T20:00:16Z")

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In this discussion [How to make a vector of parametric composite types? - #11 by Olivier\_Merchiers](https://discourse.julialang.org/t/how-to-make-a-vector-of-parametric-composite-types/2439/11) it also appeared from benchmarks that empty instances were faster than using types.

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