[cfe-dev] clangd and deduced return types

[Haojian Wu via cfe-dev]

Hello Ray,

Thanks for the report. Yeah, it is an issue of "SkipFunctionBody" when
building the AST (in your "fooc" case, we need to see the function body
before using it), I have sent out a fix https://reviews.llvm.org/D46684.

On Thu, May 10, 2018 at 12:25 AM, Raymond Glover via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hello,
>
> I have recently started clangd and had immediate success. However my
> project has a dependency which makes good use of c++14 return type
> deduction for functions, which when used create errors that prevent me from
> using the "go to definition" feature in my IDE. Here is a minimal example
> containing two files:
>
> -- main.cpp --
>
> #include "util.h"
>
> template <typename T>
> auto fooa(T a) { return a; }
>
> int main() {
>     fooa(0); // ok
>     foob(0); // ok
>     fooc(0); // error: function 'fooc<int>' with deduced
>              // return type cannot be used before
>              // it is defined
>     return 0;
> }
>
> -- util.h --
>
> template <typename T>
> auto foob(T a) -> decltype(a) { return a; }
>
> template <typename T>
> auto fooc(T a) { return a; }
>
> --
>
> Is this a known limitation, or a bad configuration on my part? I'm using a
> packaged version of clang-tools referencing svn331828.
>
> Ray
>
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>
>
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