# Restrict type of value type parameter

**URL:** <https://discourse.julialang.org/t/restrict-type-of-value-type-parameter/12127>\
**Category:** General Usage\
**Tags:** question\
**Created:** [July 3, 2018, 1:44pm UTC](https://discourse.julialang.org/t/restrict-type-of-value-type-parameter/12127 "2018-07-03T13:44:47Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Post date:** [March 10, 2021, 10:21am UTC](https://discourse.julialang.org/t/restrict-type-of-value-type-parameter/12127/8 "2021-03-10T10:21:23Z")

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It is not clear to me what you are doing (please open a separate topic with an MWE if you need further help). In any case, validating in the constructor is still the recommended method.

> [@Please read: make it easier to help you](https://discourse.julialang.org/t/psa-make-it-easier-to-help-you/14757):
>
> Welcome to the Julia Discourse! We are enthusiastic about helping Julia programmers, both beginner and experienced. This public service announcement (PSA) outlines best practices when asking for help. Following these points makes it easier for us to help you and more likely you’ll get a prompt, useful answer. Keywords are highlighted to make it easier to refer to specific points. Choose a descriptive title that captures the key part of your question, eg “plots with multiple axes” instead of …

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