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Add `@hashable` metafunction · iopenstack/cppfront@4641ad2 · GitHub

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Add @hashable metafunction
Adds a `hash() -> size_t` function Memberwise semantics, using `std::hash` for data members and `base::hash` for base classes
1 parent d3635e6 commit 4641ad2

15 files changed

Lines changed: 617 additions & 402 deletions

‎include/cpp2util.h‎

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@@ -852,7 +852,7 @@ using constness_like_t =
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>;
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template<class T, class U>
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[[nodiscard]] constexpr auto&& forward_like(U&& x) noexcept
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[[nodiscard]] constexpr auto forward_like(U&& x) noexcept -> decltype(auto)
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{
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constexpr bool is_adding_const = std::is_const_v<std::remove_reference_t<T>>;
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if constexpr (std::is_lvalue_reference_v<T&&>)

‎regression-tests/pure2-hashable.cpp2‎

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base: @struct @hashable type = {
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h: i32;
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}
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mystruct: @struct @hashable type = {
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this: base = (1);
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i: i32;
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j: std::string;
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k: u64;
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}
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main: () = {
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x: mystruct = (2, "three", 4u);
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std::cout << x.hash();
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}

‎regression-tests/test-results/clang-12-c++20/pure2-hashable.cpp.execution‎

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10166087914140344613

‎regression-tests/test-results/gcc-10-c++20/pure2-hashable.cpp.output‎

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pure2-hashable.cpp2:3:27: error: expected ‘;’ at end of member declaration
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In file included from pure2-hashable.cpp:7:
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../../../include/cpp2util.h:10005:47: error: static assertion failed: GCC 11 or higher is required to support variables and type-scope functions that have a 'requires' clause. This includes a type-scope 'forward' parameter of non-wildcard type, such as 'func: (this, forward s: std::string)', which relies on being able to add a 'requires' clause - in that case, use 'forward s: _' instead if you need the result to compile with GCC 10.
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pure2-hashable.cpp2:4:1: note: in expansion of macro ‘CPP2_REQUIRES_’
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pure2-hashable.cpp2:6:42: error: expected ‘;’ at end of member declaration
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In file included from pure2-hashable.cpp:7:
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../../../include/cpp2util.h:10005:47: error: static assertion failed: GCC 11 or higher is required to support variables and type-scope functions that have a 'requires' clause. This includes a type-scope 'forward' parameter of non-wildcard type, such as 'func: (this, forward s: std::string)', which relies on being able to add a 'requires' clause - in that case, use 'forward s: _' instead if you need the result to compile with GCC 10.
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pure2-hashable.cpp2:7:1: note: in expansion of macro ‘CPP2_REQUIRES_’
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pure2-hashable.cpp2:10:53: error: expected ‘;’ at end of member declaration
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In file included from pure2-hashable.cpp:7:
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../../../include/cpp2util.h:10005:47: error: static assertion failed: GCC 11 or higher is required to support variables and type-scope functions that have a 'requires' clause. This includes a type-scope 'forward' parameter of non-wildcard type, such as 'func: (this, forward s: std::string)', which relies on being able to add a 'requires' clause - in that case, use 'forward s: _' instead if you need the result to compile with GCC 10.
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pure2-hashable.cpp2:11:1: note: in expansion of macro ‘CPP2_REQUIRES_’
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pure2-hashable.cpp2:3:1: error: no declaration matches ‘base::base(auto:101&&) requires is_convertible_v<typename std::remove_cv<typename std::remove_reference<decltype(base::__ct ::h_)>::type>::type, const std::add_const_t&>’
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pure2-hashable.cpp2:1:7: note: candidates are: ‘constexpr base::base(base&&)’
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pure2-hashable.cpp2:1:7: note: ‘constexpr base::base(const base&)’
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pure2-hashable.cpp2:3:13: note: ‘template<class auto:96> base::base(auto:96&&)’
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pure2-hashable.cpp2:1:7: note: ‘class base’ defined here
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pure2-hashable.cpp2:5:83: error: expected unqualified-id before ‘{’ token
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pure2-hashable.cpp2:6:6: error: no declaration matches ‘base& base::operator=(auto:102&&) requires is_convertible_v<typename std::remove_cv<typename std::remove_reference<decltype(base::operator=::h_)>::type>::type, const std::add_const_t&>’
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pure2-hashable.cpp2:1:7: note: candidates are: ‘constexpr base& base::operator=(base&&)’
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pure2-hashable.cpp2:1:7: note: ‘constexpr base& base::operator=(const base&)’
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pure2-hashable.cpp2:6:14: note: ‘template<class auto:97> base& base::operator=(auto:97&&)’
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pure2-hashable.cpp2:1:7: note: ‘class base’ defined here
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pure2-hashable.cpp2:11:1: error: no declaration matches ‘mystruct::mystruct(auto:103&&, auto:104&&, auto:105&&) requires (is_convertible_v<typename std::remove_cv<typename std::remove_reference<decltype(mystruct::__ct ::i_)>::type>::type, const std::add_const_t&>) && (is_convertible_v<typename std::remove_cv<typename std::remove_reference<decltype(mystruct::__ct ::j_)>::type>::type, const std::__cxx11::add_const_t<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >&>) && (is_convertible_v<typename std::remove_cv<typename std::remove_reference<decltype(mystruct::__ct ::k_)>::type>::type, const std::add_const_t&>)’
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pure2-hashable.cpp2:5:7: note: candidates are: ‘mystruct::mystruct(mystruct&&)’
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pure2-hashable.cpp2:5:7: note: ‘mystruct::mystruct(const mystruct&)’
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pure2-hashable.cpp2:10:13: note: ‘template<class auto:98, class auto:99, class auto:100> mystruct::mystruct(auto:98&&, auto:99&&, auto:100&&)’
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pure2-hashable.cpp2:5:7: note: ‘class mystruct’ defined here
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pure2-hashable.cpp2:14:104: error: mixing declarations and function-definitions is forbidden
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pure2-hashable.cpp2:14:107: error: expected constructor, destructor, or type conversion before ‘{’ token
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pure2-hashable.cpp2:15:104: error: expected unqualified-id before ‘,’ token
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pure2-hashable.cpp2:15:107: error: expected constructor, destructor, or type conversion before ‘{’ token
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pure2-hashable.cpp2:16:104: error: expected unqualified-id before ‘,’ token
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pure2-hashable.cpp2:16:107: error: expected constructor, destructor, or type conversion before ‘{’ token
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pure2-hashable.cpp2:16:127: error: expected unqualified-id before ‘{’ token

‎regression-tests/test-results/gcc-14-c++2b/gcc-version.output‎

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g++ (GCC) 14.2.1 20240801 (Red Hat 14.2.1-1)
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g++ (GCC) 14.2.1 20240912 (Red Hat 14.2.1-3)
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Copyright (C) 2024 Free Software Foundation, Inc.
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This is free software; see the source for copying conditions. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

‎regression-tests/test-results/gcc-14-c++2b/pure2-hashable.cpp.execution‎

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10166087914140344613

‎regression-tests/test-results/msvc-2022-c++latest/pure2-hashable.cpp.execution‎

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13273923326899311054

‎regression-tests/test-results/msvc-2022-c++latest/pure2-hashable.cpp.output‎

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pure2-hashable.cpp

‎regression-tests/test-results/pure2-hashable.cpp‎

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#define CPP2_IMPORT_STD Yes
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//=== Cpp2 type declarations ====================================================
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#include "cpp2util.h"
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#line 1 "pure2-hashable.cpp2"
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class base;
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#line 2 "pure2-hashable.cpp2"
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#line 5 "pure2-hashable.cpp2"
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class mystruct;
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//=== Cpp2 type definitions and function declarations ===========================
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#line 1 "pure2-hashable.cpp2"
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class base {
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#line 2 "pure2-hashable.cpp2"
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public: cpp2::i32 h;
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public: base(auto&& h_)
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CPP2_REQUIRES_ (std::is_convertible_v<CPP2_TYPEOF(h_), std::add_const_t<cpp2::i32>&>) ;
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public: auto operator=(auto&& h_) -> base&
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CPP2_REQUIRES_ (std::is_convertible_v<CPP2_TYPEOF(h_), std::add_const_t<cpp2::i32>&>) ;
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public: [[nodiscard]] auto hash() const& -> size_t;
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#line 3 "pure2-hashable.cpp2"
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};
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class mystruct: public base {
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public: cpp2::i32 i;
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public: std::string j;
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public: cpp2::u64 k;
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public: mystruct(auto&& i_, auto&& j_, auto&& k_)
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CPP2_REQUIRES_ (std::is_convertible_v<CPP2_TYPEOF(i_), std::add_const_t<cpp2::i32>&> && std::is_convertible_v<CPP2_TYPEOF(j_), std::add_const_t<std::string>&> && std::is_convertible_v<CPP2_TYPEOF(k_), std::add_const_t<cpp2::u64>&>) ;
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public: [[nodiscard]] auto hash() const& -> size_t;
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#line 10 "pure2-hashable.cpp2"
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};
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auto main() -> int;
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//=== Cpp2 function definitions =================================================
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#line 1 "pure2-hashable.cpp2"
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base::base(auto&& h_)
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requires (std::is_convertible_v<CPP2_TYPEOF(h_), std::add_const_t<cpp2::i32>&>)
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: h{ CPP2_FORWARD(h_) }{}
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auto base::operator=(auto&& h_) -> base&
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requires (std::is_convertible_v<CPP2_TYPEOF(h_), std::add_const_t<cpp2::i32>&>) {
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h = CPP2_FORWARD(h_);
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return *this;}
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[[nodiscard]] auto base::hash() const& -> size_t { return std::hash<cpp2::i32>()(h); }
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mystruct::mystruct(auto&& i_, auto&& j_, auto&& k_)
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requires (std::is_convertible_v<CPP2_TYPEOF(i_), std::add_const_t<cpp2::i32>&> && std::is_convertible_v<CPP2_TYPEOF(j_), std::add_const_t<std::string>&> && std::is_convertible_v<CPP2_TYPEOF(k_), std::add_const_t<cpp2::u64>&>)
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: base{ (1) }
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, i{ CPP2_FORWARD(i_) }
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, j{ CPP2_FORWARD(j_) }
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, k{ CPP2_FORWARD(k_) }{}
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[[nodiscard]] auto mystruct::hash() const& -> size_t { return base::hash() ^ (std::hash<cpp2::i32>()(i) << 1) ^ (std::hash<std::string>()(j) << 2) ^ (std::hash<cpp2::u64>()(k) << 3); }
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#line 12 "pure2-hashable.cpp2"
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auto main() -> int{
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mystruct x {2, "three", 4u};
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std::cout << CPP2_UFCS(hash)(cpp2::move(x));
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}
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‎regression-tests/test-results/pure2-hashable.cpp2.output‎

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pure2-hashable.cpp2... ok (all Cpp2, passes safety checks)
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