# Default constructor for parametric types in 0.7

**URL:** <https://discourse.julialang.org/t/default-constructor-for-parametric-types-in-0-7/10344>\
**Category:** General Usage\
**Created:** [April 14, 2018, 8:31pm UTC](https://discourse.julialang.org/t/default-constructor-for-parametric-types-in-0-7/10344 "2018-04-14T20:31:32Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Qiyamah](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/qiyamah/32/2660_2.png) [@Qiyamah](https://discourse.julialang.org/u/Qiyamah)\
**Post date:** [April 14, 2018, 8:31pm UTC](https://discourse.julialang.org/t/default-constructor-for-parametric-types-in-0-7/10344/1 "2018-04-14T20:31:32Z")

</div>

Hi,  
this no longer works in v 0.7  
what is the proper way to do this?

```nohighlight
julia> struct XDD{T}
           x::T
           XDD() = new{T}()
       end

julia> a= XDD{Int}()
ERROR: MethodError: no method matching XDD{Int64}()

```

---

<div class="post-metadata">

**Author:** ![marius311](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/marius311/32/3953_2.png) [@marius311](https://discourse.julialang.org/u/marius311)\
**Post date:** [April 14, 2018, 8:41pm UTC](https://discourse.julialang.org/t/default-constructor-for-parametric-types-in-0-7/10344/2 "2018-04-14T20:41:59Z")

</div>

I think you want,

```julia
struct XDD{T}
   x::T
   XDD{T}() where {T} = new{T}()
end

```

---

<div class="post-metadata">

**Author:** ![Gnimuc](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/gnimuc/32/2194_2.png) [@Gnimuc](https://discourse.julialang.org/u/Gnimuc)\
**Post date:** [April 15, 2018, 12:57am UTC](https://discourse.julialang.org/t/default-constructor-for-parametric-types-in-0-7/10344/3 "2018-04-15T00:57:02Z")

</div>

```julia
julia> struct XDD{T}
           x::T
           XDD() = new{T}()
       end

```

I’m wondering why this isn’t an “outer-only constructor” on v0.6.