make_ready_future<void> bug

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#341 opened on May 25, 2021 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: cpp
Domain: backend

Research direction

Start at future.hpp around line 4388 and reproduce the issue with Boost 1.76.0 using make_ready_future. Inspect overload resolution for promise and the variadic overload; done means the void-specific function is selected without attempting to call the unavailable emplace method.

Written by the indexing model from the issue text.

Description

Used boost version 1.76.0

next code from future.hpp, line 4388
promise<void> have no emplace method

 // variadic overload
#if ! defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
  template <class T, class ...Args>
  BOOST_THREAD_FUTURE<T> make_ready_future(Args&&... args)
  {
    promise<T> p;
    p.emplace(forward<Args>(args)...);
    return p.get_future();

  }
#endif

header contains correct function for promise<void>, but compiler always select variadic-templated method instead of normal

Dominant language: C++
Stars: 213
Forks: 171
PR merge metrics: No merged PRs in 30d

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