[libcxx-commits] [libcxx] [libc++][complex] P2819R2: Add `tuple` protocol to `complex` (PR #79744)

[Mark de Wever via libcxx-commits]

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@@ -227,6 +227,31 @@ template<class T> complex<T> sqrt (const complex<T>&);
 template<class T> complex<T> tan (const complex<T>&);
 template<class T> complex<T> tanh (const complex<T>&);
 
+  // [complex.tuple], tuple interface
+  template<class T> struct tuple_size;                             // Since C++26
+  template<size_t I, class T> struct tuple_element;                // Since C++26
+  template<class T> struct tuple_size<complex<T>>;                 // Since C++26
+  template<size_t I, class T> struct tuple_element<I, complex<T>>; // Since C++26
+  template<size_t I, class T>
+    constexpr T& get(complex<T>&) noexcept;                        // Since C++26
+  template<size_t I, class T>
+    constexpr T&& get(complex<T>&&) noexcept;                      // Since C++26
+  template<size_t I, class T>
+    constexpr const T& get(const complex<T>&) noexcept;            // Since C++26
+  template<size_t I, class T>
+    constexpr const T&& get(const complex<T>&&) noexcept;          // Since C++26
+
+  // [complex.literals], complex literals
+  inline namespace literals {
+  inline namespace complex_literals {
+    constexpr complex<long double> operator""il(long double);        // Since C++14
+    constexpr complex<long double> operator""il(unsigned long long); // Since C++14
+    constexpr complex<double> operator""i(long double);              // Since C++14
+    constexpr complex<double> operator""i(unsigned long long);       // Since C++14
+    constexpr complex<float> operator""if(long double);              // Since C++14
+    constexpr complex<float> operator""if(unsigned long long);       // Since C++14
+  }
+  }
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mordante wrote:

I see no new includes in this header, I would expect `__fwd/complex.h` and header(s?) for `tuple_size` and `tuple_element`.

https://github.com/llvm/llvm-project/pull/79744