#include <ranges>
arity: @struct type = {
range: type == std::ranges::iota_view<i16, i16>;
value: range = ();
begin: (this) -> _ = {
return std::ranges::iterator_t<range>(); // Deduce.
return value.begin(); // OK.
return begin(); // Recurses.
}
// error: function 'end' with deduced return type cannot be used before it is defined
end: (this) value.end();
}
main: () = { }
Cpp2 lowered to Cpp1:
```C++
//=== Cpp2 type declarations ====================================================
#include "cpp2util.h"
#line 1 "/app/example.cpp2"
#line 2 "/app/example.cpp2"
class arity;
//=== Cpp2 type definitions and function declarations ===========================
#line 1 "/app/example.cpp2"
#include
class arity {
#line 3 "/app/example.cpp2"
public: using range = std::ranges::iota_view;
public: range value {};
public: [[nodiscard]] auto begin() const& -> auto;
#line 10 "/app/example.cpp2"
// error: function 'end' with deduced return type cannot be used before it is defined
public: [[nodiscard]] auto end() const& -> auto;
};
auto main() -> int;
//=== Cpp2 function definitions =================================================
#line 1 "/app/example.cpp2"
#line 5 "/app/example.cpp2"
[[nodiscard]] auto arity::begin() const& -> auto{
return std::ranges::iterator_t(); // Deduce.
return CPP2_UFCS(begin)(value); // OK.
return begin(); // Recurses.
}
[[nodiscard]] auto arity::end() const& -> auto { return CPP2_UFCS(end)(value); }
auto main() -> int{}
```
main.cpp2:11:69: error: function 'end' with deduced return type cannot be used before it is defined
11 | [[nodiscard]] auto arity::end() const& -> auto { return CPP2_UFCS(end)(value); }
| ^
main.cpp2:11:29: note: 'end' declared here
11 | [[nodiscard]] auto arity::end() const& -> auto { return CPP2_UFCS(end)(value); }
| ^
Title: Disable UFCS on deduced return type not yet deduced (
f: () x.f();).Minimal reproducer (https://cpp2.godbolt.org/z/x8GsWo7cT):
Commands:
```bash cppfront main.cpp2 clang++18 -std=c++23 -stdlib=libc++ -lc++abi -pedantic-errors -Wall -Wextra -Wconversion -Werror=unused-result -Werror=unused-value -Werror=unused-parameter -I . main.cpp ```Expected result: For
arity::endto be well-formed by not naming itself in its body.Actual result and error:
Cpp2 lowered to Cpp1:
```C++ //=== Cpp2 type declarations ==================================================== #include "cpp2util.h" #line 1 "/app/example.cpp2" #line 2 "/app/example.cpp2" class arity; //=== Cpp2 type definitions and function declarations =========================== #line 1 "/app/example.cpp2" #includeOutput:
See also:
550
863
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