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This is an experimental library that has evolved to P1371, proposed for C++23.

Home Page: https://wg21.link/p1371

License: Boost Software License 1.0

C++ 92.92% CMake 3.28% Python 3.80%

pattern-matching

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patterns's Issues

Returning std::nullopt from Pattern

[deleted]

Add Regex pattern documentation

Update the requirements for `Product`

Support for C-style array and Aggregates.

Linker error with test

Steps:

git clone .....
git submodule init
git submodule update --init --recursive
mkdir bla && cd bla
cmake -G Ninja ./ ../
then enabled tests in the cmake cache before building
ninja
and got these type of errors:

test/CMakeFiles/array.dir/array.cpp.o:
 In function `auto mpark::patterns::detail::grouped_indices<&mpark::patterns::detail::{lambda(unsigned long)#2}::_FUN, , 9223372036854775807ul, 18446744073709551615ul, 0ul, 1ul>(mpark::patterns::lib::list<>, std::integer_sequence<unsigned long, 9223372036854775807ul, 18446744073709551615ul>, mpark::patterns::lib::list<><unsigned long, 0ul, 1ul>)::{lambda()#1}::operator()() const':
array.cpp:(.text+0x9a13): undefined reference to `mpark::patterns::lib::list<mpark::patterns::lib::indexed_type<9223372036854775807ul, std::integer_sequence<unsigned long, 0ul> > > mpark::patterns::detail::insert<9223372036854775807ul, 0ul>(mpark::patterns::lib::list<>)'
collect2: error: ld returned 1 exit status
[26/30] Building CXX object test/CMakeFiles/when.dir/when.cpp.o
ninja: build stopped: subcommand failed.

compiler used was: gcc (Ubuntu 7.2.0-8ubuntu3) 7.2.0

Link to ISO proposal

I think it would be useful to add at least a related work link to your ISO proposal (i.e. https://github.com/mpark/wg21 & http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1260r0.pdf ) on the front page.

A discussion of how the two differ would be even better.
For instance I note that the "WHEN clause" of this project becomes a pattern guard in the proposal.

A related but distinct issue is the relationship between this and the earlier Mach7. Why use one rather than the other?

Does not compile under MSVC 2019

While not explicitly stated as being a supported compiler, the Microsoft Visual C++ compiler should fall under "standard conformant C++17 compiler".

Trying to compile gives an error on C++17 checking:
https://godbolt.org/z/frsGsb

Additionally, if this is circumvented by commenting out the check in config.hpp , some explicit GCC pragmas in as_tuple.hpp are unrecognized by MSVC and needed to be commented out as well.

Finally, when I tried to compile the fizzbuzz example, I got the following error: Context does not allow for disambiguation of overloaded function

Microsoft (R) Build Engine version 16.7.0+b89cb5fde for .NET Framework
Copyright (C) Microsoft Corporation. All rights reserved.

  main.cpp
C:\dev\c++\my_proj\third_party\patterns\include\mpark\patterns/match.hpp(736,30): message : Context does not allow for disambiguation of overloaded function [C:\dev\c++\my_proj\build\prog.vcxproj]
C:\dev\c++\my_proj\third_party\patterns\include\mpark\patterns/match.hpp(987): message : see reference to function template instantiation 'auto mpark::patterns::try_match<int,int,std::tuple<_Ty &&,_Ty &&>,mpark::patter
ns::detail::Match<R,int,int>::()::<lambda_1>::()::<lambda_1>>(const mpark::patterns::Ds<int,int> &,Values &&,F &&)' being compiled [C:\dev\c++\my_proj\build\prog.vcxproj]
          with
          [
              _Ty=int,
              R=mpark::patterns::detail::Deduce,
              Values=std::tuple<int &&,int &&>,
              F=mpark::patterns::detail::Match<mpark::patterns::detail::Deduce,int,int>::()::<lambda_1>::()::<lambda_1>
          ]
C:\dev\c++\my_proj\src\main.cpp(46): message : see reference to function template instantiation 'decltype(auto) mpark::patterns::detail::Match<R,int,int>::operator ()<mpark::patterns::detail::Pattern<false,int,int>,Rhs
&&,mpark::patterns::detail::Case<mpark::patterns::detail::Pattern<false,int,mpark::patterns::Identifier<18446744073709551615,void>>,fizzbuzz::<lambda_2> &&>,mpark::patterns::detail::Case<mpark::patterns::detail::Pattern<false,mpark::patt
erns::Identifier<18446744073709551615,void>,int>,fizzbuzz::<lambda_3> &&>,mpark::patterns::detail::Case<mpark::patterns::detail::Pattern<false,mpark::patterns::Identifier<18446744073709551615,void>,mpark::patterns::Identifier<18446744073
709551615,void>>,fizzbuzz::<lambda_4> &&>>(mpark::patterns::detail::Case<mpark::patterns::detail::Pattern<false,int,int>,Rhs &&> &&,mpark::patterns::detail::Case<mpark::patterns::detail::Pattern<false,int,mpark::patterns::Identifier<1844
6744073709551615,void>>,fizzbuzz::<lambda_2> &&> &&,mpark::patterns::detail::Case<mpark::patterns::detail::Pattern<false,mpark::patterns::Identifier<18446744073709551615,void>,int>,fizzbuzz::<lambda_3> &&> &&,mpark::patterns::detail::Cas
e<mpark::patterns::detail::Pattern<false,mpark::patterns::Identifier<18446744073709551615,void>,mpark::patterns::Identifier<18446744073709551615,void>>,fizzbuzz::<lambda_4> &&> &&) &&' being compiled [C:\dev\c++\game_dev\opengl_platforme
r\build\prog.vcxproj]
          with
          [
              R=mpark::patterns::detail::Deduce,
              Rhs=fizzbuzz::<lambda_1>
          ]

Again, while MSVC isn't explicitly supported, I think it could be worthwhile to state that in practice only GCC and Clang are supported and tested.

Cool project never the less!

Set up Travis CI.

example function fails to compile

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