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src: simplify SFINAE of ToStringHelper::BaseConvert #44306

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merged 1 commit into from
Sep 1, 2022

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@F3n67u F3n67u commented Aug 20, 2022

Simplify SFINAE of ToStringHelper::BaseConvert using technique from https://www.fluentcpp.com/2018/05/18/make-sfinae-pretty-2-hidden-beauty-sfinae/

@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. needs-ci PRs that need a full CI run. labels Aug 20, 2022
@F3n67u F3n67u changed the title src: simplify enable_if logic of ToStringHelper::BaseConvert src: simplify SFINAE of ToStringHelper::BaseConvert Aug 20, 2022
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LGTM

@RaisinTen RaisinTen added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Aug 31, 2022
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@nodejs-github-bot nodejs-github-bot merged commit f36813c into nodejs:main Sep 1, 2022
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Landed in f36813c

@F3n67u F3n67u deleted the simplify_enable_if branch September 1, 2022 06:38
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For some reason, this is not compiling in the v16.x branch. It may be related to a cpp version or something.

esult -O3 -fno-omit-frame-pointer -fno-rtti -fno-exceptions -std=gnu++14 -MMD -MF /home/juanarbol/GitHub/node/out/Release/.deps//home/juanarbol/GitHub/node/out/Release/obj.target/libnode/src/module_wrap.o.d.raw   -c
In file included from ../src/js_stream.cc:5:
In file included from ../src/node_errors.h:6:
../src/debug_utils-inl.h:32:46: error: no template named 'is_integral_v' in namespace 'std'; did you mean 'is_integral'?
            typename = std::enable_if_t<std::is_integral_v<T>>>
                                        ~~~~~^~~~~~~~~~~~~
                                             is_integral
/usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/type_traits:392:12: note: 'is_integral' declared here
    struct is_integral
           ^
In file included from ../src/js_stream.cc:5:
In file included from ../src/node_errors.h:6:
../src/debug_utils-inl.h:32:41: error: template argument for non-type template parameter must be an expression
            typename = std::enable_if_t<std::is_integral_v<T>>>

And the complaints grow and grow.

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is_integral_v is C++17 only, so we would need to replace that with is_integral<T>::value if we want to backport (probably fine if we don't backport this too)

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