in Channel put!, convert value to Channel type
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JeffBezanson
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Sep 10, 2018
base/channels.jl
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| check_channel_state(c) | ||
| isbuffered(c) ? put_buffered(c,v) : put_unbuffered(c,v) | ||
| vT = convert(T, v) |
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It's no longer a performance issue to reuse the name v for this. Style is a different question, but I thought I'd mention it.
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Thanks. I was partly skeptical when I did this. Will add a commit to reuse name.
`put!(ch::Channel{T}, v)` should convert `v` to type `T`.
This can prevent errors like:
```
julia> c = Channel{Int}(0)
Channel{Int64}(sz_max:0,sz_curr:0)
julia> @async put!(c, :a)
Task (runnable) @0x00007ff5b9d79270
julia> isready(c) && take!(c)
ERROR: TypeError: in take_unbuffered, in typeassert, expected Int64, got Symbol
Stacktrace:
[1] take_unbuffered(::Channel{Int64}) at ./channels.jl:323
[2] take!(::Channel{Int64}) at ./channels.jl:306
[3] top-level scope at none:0
```
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JeffBezanson
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I think this is a bugfix, but will see what triage thinks about backporting. |
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I'd be curious to hear what @DatName's objection to this is. |
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@StefanKarpinski I think, that if you are explicitly creating a channel for Int, you should not be putting some other stuff in there silently. It is easy to do a convertion explicitly on user's side, if needed, so no need for this "behind-the-curtains-magic", so to speak. |
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I see your point of view. However, we do automatic conversion when values are put into typed contexts of all kinds already. Our conversions are quite strict about what conversions they will do without error: the value must be convertible exactly or an |
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For values that aren't convertible (e.g. a string) this gives an error sooner than we did before. |
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changes between Julia 1.0 and 1.1, including: - Custom .css-style for compat admonitions. - Information about compat annotations to CONTRIBUTING.md. - NEWS.md entry for PRs #30090, #30035, #30022, #29978, #29969, #29858, #29845, #29754, #29638, #29636, #29615, #29600, #29506, #29469, #29316, #29259, #29178, #29153, #29033, #28902, #28761, #28745, #28708, #28696, #29997, #28790, #29092, #29108, #29782 - Compat annotation for PRs #30090, #30013, #29978, #29890, #29858, #29827, #29754, #29679, #29636, #29623, #29600, #29440, #29316, #29259, #29178, #29157, #29153, #29033, #28902, #28878, #28761, #28708, #28156, #29733, #29670, #29997, #28790, #29092, #29108, #29782, #25278 - Documentation for broadcasting CartesianIndices (#30230). - Documentation for Base.julia_cmd(). - Documentation for colon constructor of CartesianIndices (#29440). - Documentation for ^(::Matrix, ::Number) and ^(::Number, ::Matrix). - Run NEWS-update.jl. Co-authored-by: Morten Piibeleht <morten.piibeleht@gmail.com> Co-authored-by: Fredrik Ekre <ekrefredrik@gmail.com>
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changes between Julia 1.0 and 1.1, including: - Custom .css-style for compat admonitions. - Information about compat annotations to CONTRIBUTING.md. - NEWS.md entry for PRs #30090, #30035, #30022, #29978, #29969, #29858, #29845, #29754, #29638, #29636, #29615, #29600, #29506, #29469, #29316, #29259, #29178, #29153, #29033, #28902, #28761, #28745, #28708, #28696, #29997, #28790, #29092, #29108, #29782 - Compat annotation for PRs #30090, #30013, #29978, #29890, #29858, #29827, #29754, #29679, #29636, #29623, #29600, #29440, #29316, #29259, #29178, #29157, #29153, #29033, #28902, #28878, #28761, #28708, #28156, #29733, #29670, #29997, #28790, #29092, #29108, #29782, #25278 - Documentation for broadcasting CartesianIndices (#30230). - Documentation for Base.julia_cmd(). - Documentation for colon constructor of CartesianIndices (#29440). - Documentation for ^(::Matrix, ::Number) and ^(::Number, ::Matrix). - Run NEWS-update.jl. Co-authored-by: Morten Piibeleht <morten.piibeleht@gmail.com> Co-authored-by: Fredrik Ekre <ekrefredrik@gmail.com>
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Addition of NEWS and compat admonitions for important changes between Julia 1.0 and 1.1, including: - Custom .css-style for compat admonitions. - Information about compat annotations to CONTRIBUTING.md. - NEWS.md entry for PRs #30090, #30035, #30022, #29978, #29969, #29858, #29845, #29754, #29638, #29636, #29615, #29600, #29506, #29469, #29316, #29259, #29178, #29153, #29033, #28902, #28761, #28745, #28708, #28696, #29997, #28790, #29092, #29108, #29782 - Compat annotation for PRs #30090, #30013, #29978, #29890, #29858, #29827, #29754, #29679, #29636, #29623, #29600, #29440, #29316, #29259, #29178, #29157, #29153, #29033, #28902, #28878, #28761, #28708, #28156, #29733, #29670, #29997, #28790, #29092, #29108, #29782, #25278 - Documentation for broadcasting CartesianIndices (#30230). - Documentation for Base.julia_cmd(). - Documentation for colon constructor of CartesianIndices (#29440). - Documentation for ^(::Matrix, ::Number) and ^(::Number, ::Matrix). - Run NEWS-update.jl. Co-authored-by: Morten Piibeleht <morten.piibeleht@gmail.com> Co-authored-by: Fredrik Ekre <ekrefredrik@gmail.com>
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put!(ch::Channel{T}, v)should convertvto typeT.This can prevent errors like: