boostorg/hana

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Your standard library for metaprogramming

Stars: 1.9k
Forks: 225
Open beginner issues: 0
Indexed issues: 85

Dominant language: C++
License: BSL-1.0
Last GitHub push: Jul 3, 2025
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted
PR merge metrics: No merged PRs in 30d

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85 open issues indexed

warning: identifier '_c' preceded by whitespace in a literal operator declaration is deprecated Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

boostorg/hana#535 · 1 comment · Opened Oct 11, 2025
hana::less does not work for adapted structs Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

boostorg/hana#530 · 3 comments · Opened May 23, 2024
Strange behavior of `hana::partial` Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

boostorg/hana#528 · Opened Mar 7, 2024
Hana build failed due to fatal error C1189: #error: "No support for this compiler." Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

boostorg/hana#526 · Opened Nov 29, 2023
Integrate boost::pfr into hana Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

boostorg/hana#525 · 2 reactions · Opened Nov 26, 2023
Is it possible to join two functors to one? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

boostorg/hana#522 · 1 comment · Opened Aug 24, 2023
Question: has clang __PRETTY_FUNCTION__ behavior changed in clang 16.0.0 ? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

boostorg/hana#518 · 1 comment · Opened Jun 20, 2023
some compile error when I use msvc2022 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

boostorg/hana#516 · 4 comments · Opened Mar 16, 2023
A proposal that works like BOOST_HANA_DEFINE/ADAPT_STRUCT and makes it 5x faster. Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

boostorg/hana#514 · 2 comments · Opened Feb 1, 2023
Hana failed to build with error C2065, error C2977, error C2913... on MSVC Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

boostorg/hana#512 · 2 comments · Opened Dec 9, 2022
boost::hana::drop_front doesn't respect refness Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

boostorg/hana#508 · 1 comment · Opened Aug 17, 2022
Circular dependency of boost/hana/concept/struct.hpp and boost/hana/accessors.hpp breaks tooling Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

boostorg/hana#507 · Opened Aug 4, 2022
Integrate Boost.Describe into Boost.Hana? Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

boostorg/hana#498 · Opened Dec 9, 2021
Passing move-only arguments as 2nd(-and-following) argument(s) to hana::partial results in compile-time failure Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

boostorg/hana#496 · Opened Oct 29, 2021
hana::sort seems like it should work with hana::experimental::types but does't Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

boostorg/hana#495 · 3 comments · Opened Oct 23, 2021
Enum concept Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#491 · Opened Jul 29, 2021
BOOST_HANA_ADAPT_STRUCT for templates? Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

boostorg/hana#484 · 1 comment · Opened Mar 2, 2021
Glitches in the Documentation Open

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

boostorg/hana#483 · 2 comments · 1 reaction · Opened Feb 15, 2021
Error when compiling Hana according to "How to contribute" Open

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

boostorg/hana#481 · 4 comments · Opened Feb 11, 2021
Defaulting <=> and == where possible (c++20) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#478 · 5 comments · Opened Jan 16, 2021
Documentation of `hana::apply` should link to `hana::unpack` Open

Difficulty 1/5 Under an hour Newbie friendliness 50/100

boostorg/hana#469 · 1 reaction · Opened Jul 18, 2020
hana::fix doesn't (consistently) work on lambdas with deduced return type Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#467 · 2 comments · Opened Jun 4, 2020
Invalid requirements for insert in the documentation Open

Difficulty 1/5 Under an hour Newbie friendliness 65/100

boostorg/hana#466 · Opened May 23, 2020
Runtime support for searchables Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

boostorg/hana#456 · 2 comments · Opened Aug 6, 2019
Analog of hana::template_ for lifting non-type templates Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#455 · 2 comments · Opened Jul 31, 2019
Conversion of non-copyable Struct to tuple Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

boostorg/hana#452 · Opened Jul 9, 2019
User-selectable hashes for hana::map Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#451 · 6 comments · Opened Jul 8, 2019
Please document hana::transform side effect ordering Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

boostorg/hana#448 · 1 comment · Opened May 22, 2019
Support hash of hana::integral_constant with enum types Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

boostorg/hana#439 · 4 comments · Opened Feb 15, 2019
pipe operator as in ranges TS Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#438 · 4 comments · Opened Feb 8, 2019
Consider adding ccache for Travis cron job Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

boostorg/hana#437 · Opened Feb 8, 2019
string length = sizeof(S::get()) / sizeof(S::get()[0]) - 1 Open

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

boostorg/hana#436 · 1 comment · Opened Feb 7, 2019
Reflection TS emulation for Hana Structs Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#435 · 2 reactions · Opened Jan 8, 2019
Feature Request: SFINAE-friendliness Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

boostorg/hana#424 · 4 comments · Opened Nov 28, 2018
Constructor Template Auto Deduction guides Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

boostorg/hana#415 · 2 reactions · Opened Jul 21, 2018
Use Boost:: (or other) namespace for cmake exports Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

boostorg/hana#414 · 4 comments · 1 reaction · Opened Jul 9, 2018
overload's constructor isn't constrained Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

boostorg/hana#412 · 2 comments · Opened Jun 30, 2018
hana::experimental::type_name - MSVC support? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

boostorg/hana#410 · Opened Jun 8, 2018
Allow default values in hana define struct Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#409 · 12 comments · 11 reactions · Opened Jun 5, 2018
BOOST_HANA_CONFIG_HAS_CONSTEXPR_LAMBDA and BOOST_HANA_CONSTEXPR_CHECK Open

MSVC

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

boostorg/hana#406 · 6 comments · Opened May 30, 2018
Can't retrieve member of model of Struct by reference Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

boostorg/hana#384 · 5 comments · Opened Jan 25, 2018
Accessing the types of members of a struct Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#383 · 3 comments · 3 reactions · Opened Jan 22, 2018
Revisit Intel Compiler Support? Open

feature

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

boostorg/hana#371 · 5 comments · Opened Nov 20, 2017
[SetTheoretic] Minimal Representation via Accessors Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#367 · 5 comments · Opened Sep 11, 2017
integral_constant type conversion and automatic type for UDL Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#366 · 2 comments · 1 reaction · Opened Sep 8, 2017
Concepts for set-theoretic functions Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

boostorg/hana#357 · 6 comments · Opened Jul 1, 2017
Comparison between compile-time string and std::string behaves unexpectedly Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

boostorg/hana#346 · 3 comments · 1 reaction · Opened May 17, 2017
Hana and C++ 17 features Open

documentation

Difficulty 4/5 3-5 days Newbie friendliness 35/100

boostorg/hana#345 · Opened May 14, 2017
Make pair trivially move constructible Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

boostorg/hana#344 · 4 comments · Opened May 10, 2017
Include base class members in BOOST_HANA_ADAPT_STRUCT Open

feature

Difficulty 5/5 Over a week Newbie friendliness 35/100

boostorg/hana#339 · 4 comments · 8 reactions · Opened Apr 23, 2017

boostorg/hana

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