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https://issues.apache.org/jira/browse/THRIFT-4662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16682465#comment-16682465
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ASF GitHub Bot commented on THRIFT-4662:
----------------------------------------
allengeorge commented on a change in pull request #1624: THRIFT-4662: Rust
const string calls function at compile time
URL: https://github.com/apache/thrift/pull/1624#discussion_r232455341
##########
File path: compiler/cpp/src/thrift/generate/t_rs_generator.cc
##########
@@ -414,6 +414,9 @@ class t_rs_generator : public t_generator {
// Return a string representing the rift `protocol::TType` given a `t_type`.
string to_rust_field_type_enum(t_type* ttype);
+ // Return a string representing the `const` rust type given a `t_type`
+ string to_rust_const_type(t_type* ttype, bool ordered_float = true);
Review comment:
Good call. Makes sense to split this out from the `to_rust_type`. Could you
please put this function declaration right before `to_rust_type`? And do the
same for implementation please? It just ensures that code that has similar
functionality is in the same part of the file.
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> Rust const string calls function at compile time
> ------------------------------------------------
>
> Key: THRIFT-4662
> URL: https://issues.apache.org/jira/browse/THRIFT-4662
> Project: Thrift
> Issue Type: Bug
> Components: Rust - Compiler
> Affects Versions: 0.11.0
> Environment: C:\Users\jake>rustup show
> Default host: x86_64-pc-windows-msvc
> stable-x86_64-pc-windows-msvc (default)
> rustc 1.30.0 (da5f414c2 2018-10-24)
> Reporter: J W
> Assignee: Allen George
> Priority: Major
>
> *For this thrift:*
> const string broker_playback_message = "mmi.developer.playback"
> *Generates:*
> // thrift -gen rs -out ../rust/thrift/src const_string.thrift
> pub const BROKER_PLAYBACK_MESSAGE: String =
> "mmi.developer.playback".to_owned();
> *Fails to compile:*
> error[E0015]: calls in constants are limited to tuple structs and tuple
> variants
> note: a limited form of compile-time function evaluation is available on a
> nightly compiler via `const fn`
> *Fix:*
> Probably want to output:
> pub const BROKER_PLAYBACK_MESSAGE: &str = "mmi.developer.playback";
>
> Looking at render_const_value() it looks like byte arrays will have the same
> issue.
>
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