Implement P0415 More constexpr for std::complex.

2018-11-23  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Implement P0415 More constexpr for std::complex.
	* include/std/complex (conj(complex<Tp>), norm(complex<Tp>)): Constexpr;
	(real(Tp), imag(Tp)): Constexpr;
	(operator@=(Tp), operator@=(complex<Tp>)): Constexpr;
	(operator@(Tp,complex<Tp>), operator@(complex<Tp>,Tp)
	operator@(complex<Tp>,complex<Tp>)): Constexpr.
	* testsuite/26_numerics/complex/comparison_operators/
	more_constexpr.cc: New test.
	* testsuite/26_numerics/complex/operators/more_constexpr.cc: New test.
	* testsuite/26_numerics/complex/requirements/
	more_constexpr.cc: New test.
	* testsuite/26_numerics/complex/value_operations/
	more_constexpr.cc: New test.
	* testsuite/26_numerics/headers/complex/synopsis.cc:
	Add _GLIBCXX20_CONSTEXPR to applicable operators; Add missing proj().
	* testsuite/26_numerics/headers/complex/synopsis.cc:
	Add _GLIBCXX20_CONSTEXPR to relevant decls.

From-SVN: r266416

libstdc++-v3/ChangeLog

+2018-11-23  Edward Smith-Rowland  <3dw4rd@verizon.net>
+
+	Implement P0415 More constexpr for std::complex.
+	* include/std/complex (conj(complex<Tp>), norm(complex<Tp>)): Constexpr;
+	(real(Tp), imag(Tp)): Constexpr;
+	(operator@=(Tp), operator@=(complex<Tp>)): Constexpr;
+	(operator@(Tp,complex<Tp>), operator@(complex<Tp>,Tp)
+	operator@(complex<Tp>,complex<Tp>)): Constexpr.
+	* testsuite/26_numerics/complex/comparison_operators/
+	more_constexpr.cc: New test.
+	* testsuite/26_numerics/complex/operators/more_constexpr.cc: New test.
+	* testsuite/26_numerics/complex/requirements/
+	more_constexpr.cc: New test.
+	* testsuite/26_numerics/complex/value_operations/
+	more_constexpr.cc: New test.
+	* testsuite/26_numerics/headers/complex/synopsis.cc:
+	Add _GLIBCXX20_CONSTEXPR to applicable operators; Add missing proj().
+	* testsuite/26_numerics/headers/complex/synopsis.cc: 
+	Add _GLIBCXX20_CONSTEXPR to relevant decls.
+
 2018-11-23  Martin Sebor  <msebor@redhat.com>
 	    Jonathan Wakely  <jwakely@redhat.com>
 

libstdc++-v3/testsuite/26_numerics/complex/comparison_operators/more_constexpr.cc

+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+// Copyright (C) 2018 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <complex>
+#include <testsuite_common_types.h>
+
+template<bool ok>
+  struct thing
+  { };
+
+// 
+template<typename _Tp>
+  void
+  test_comparison()
+  {
+    constexpr std::complex<_Tp> a{1.1, 2.2};
+    constexpr std::complex<_Tp> b{3.3, 4.4};
+    if constexpr (a == b)
+      auto c [[maybe_unused]] = a + b;
+    if constexpr (a != b)
+      auto c [[maybe_unused]] = a - b;
+
+    thing<a == b> thing1 [[maybe_unused]];
+    thing<a != b> thing2 [[maybe_unused]];
+  }
+
+int
+main()
+{
+  test_comparison<float>();
+  test_comparison<double>();
+  test_comparison<long double>();
+
+  return 0;
+}

libstdc++-v3/testsuite/26_numerics/complex/operators/more_constexpr.cc

+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+// Copyright (C) 2018 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <complex>
+#include <testsuite_common_types.h>
+
+namespace __gnu_test
+{
+  // Test constexpr symmetric complex @ real, real @ complex, complex @ complex.
+  template<typename _Tp>
+    void
+    test_operators()
+    {
+      constexpr std::complex<_Tp> a{1, 2};
+      constexpr std::complex<_Tp> b{3, 4};
+      constexpr _Tp c = 5;
+
+      constexpr auto w [[maybe_unused]] = +a;
+      constexpr auto z [[maybe_unused]] = -a;
+
+      constexpr auto apc [[maybe_unused]] = a + c;
+      constexpr auto amc [[maybe_unused]] = a - c;
+      constexpr auto atc [[maybe_unused]] = a * c;
+      constexpr auto adc [[maybe_unused]] = a / c;
+
+      constexpr auto cpa [[maybe_unused]] = c + a;
+      constexpr auto cma [[maybe_unused]] = c - a;
+      constexpr auto cta [[maybe_unused]] = c * a;
+      constexpr auto cda [[maybe_unused]] = c / a;
+
+      constexpr auto apb [[maybe_unused]] = a + b;
+      constexpr auto amb [[maybe_unused]] = a - b;
+      constexpr auto atb [[maybe_unused]] = a * b;
+      constexpr auto adb [[maybe_unused]] = a / b;
+    }
+}
+
+int main()
+{
+  __gnu_test::test_operators<float>();
+  __gnu_test::test_operators<double>();
+  __gnu_test::test_operators<long double>();
+
+  return 0;
+}

libstdc++-v3/testsuite/26_numerics/complex/requirements/more_constexpr.cc

+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+// Copyright (C) 2018 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <complex>
+#include <testsuite_common_types.h>
+
+namespace __gnu_test
+{
+
+  // Test constexpr real(val) imag(val).
+  template<typename _Tp, const int _Val = 42>
+    inline void
+    set_real(std::complex<_Tp>& a)
+    { a.real(_Val); }
+
+  template<typename _Tp, const int _Val = 42>
+    inline void
+    set_imag(std::complex<_Tp>& a)
+    { a.imag(_Val); }
+
+  template<typename _Tp>
+    void
+    test_members()
+    {
+      constexpr std::complex<_Tp> a{1.1, 2.2};
+
+      std::complex<_Tp> z = a;
+
+      set_real<_Tp, 33>(z);
+      set_imag<_Tp, 44>(z);
+    }
+
+  // Test operators @=complex and @=real.
+  template<typename _Tp, typename _Up>
+    constexpr std::complex<_Tp>
+    sum(const std::complex<_Tp>& z, const std::complex<_Up>& w)
+    {
+      std::complex<_Tp> x = z;
+      x += w;
+      return x;
+    }
+
+  template<typename _Tp, typename _Up>
+    constexpr std::complex<_Tp>
+    sum(const std::complex<_Tp>& z, _Up w)
+    {
+      std::complex<_Tp> x = z;
+      x += w;
+      return x;
+    }
+
+  template<typename _Tp, typename _Up>
+    constexpr std::complex<_Tp>
+    dif(const std::complex<_Tp>& z, const std::complex<_Up>& w)
+    {
+      std::complex<_Tp> x = z;
+      x -= w;
+      return x;
+    }
+
+  template<typename _Tp, typename _Up>
+    constexpr std::complex<_Tp>
+    dif(const std::complex<_Tp>& z, _Up w)
+    {
+      std::complex<_Tp> x = z;
+      x -= w;
+      return x;
+    }
+
+  template<typename _Tp, typename _Up>
+    constexpr std::complex<_Tp>
+    prod(const std::complex<_Tp>& z, const std::complex<_Up>& w)
+    {
+      std::complex<_Tp> x = z;
+      x *= w;
+      return x;
+    }
+
+  template<typename _Tp, typename _Up>
+    constexpr std::complex<_Tp>
+    prod(const std::complex<_Tp>& z, _Up w)
+    {
+      std::complex<_Tp> x = z;
+      x *= w;
+      return x;
+    }
+
+  template<typename _Tp, typename _Up>
+    constexpr std::complex<_Tp>
+    quot(const std::complex<_Tp>& z, const std::complex<_Up>& w)
+    {
+      std::complex<_Tp> x = z;
+      x /= w;
+      return x;
+    }
+
+  template<typename _Tp, typename _Up>
+    constexpr std::complex<_Tp>
+    quot(const std::complex<_Tp>& z, _Up w)
+    {
+      std::complex<_Tp> x = z;
+      x /= w;
+      return x;
+    }
+
+  template<typename _Tp, typename _Up>
+    void
+    test_operator_members()
+    {
+      constexpr std::complex<_Tp> a{10, 20};
+      constexpr std::complex<_Up> b{6, 8};
+      constexpr _Up c{10};
+
+      constexpr auto apc = sum(a, c);
+      static_assert(apc == std::complex<_Tp>{20, 20});
+      constexpr auto amc = dif(a, c);
+      static_assert(amc == std::complex<_Tp>{0, 20});
+      constexpr auto atc = prod(a, c);
+      static_assert(atc == std::complex<_Tp>{100, 200});
+      constexpr auto adc = quot(a, c);
+      static_assert(adc == std::complex<_Tp>{1, 2});
+
+      constexpr auto apb = sum(a, b);
+      static_assert(apb == std::complex<_Tp>{16, 28});
+      constexpr auto amb = dif(a, b);
+      static_assert(amb == std::complex<_Tp>{4, 12});
+      constexpr auto atb = prod(a, b);
+      static_assert(atb == std::complex<_Tp>{-100, 200});
+      constexpr auto adb = quot(a, b);
+      static_assert(adb == std::complex<_Tp>{11/_Tp{5}, 2/_Tp{5}});
+    }
+}
+
+int main()
+{
+  __gnu_test::test_members<float>();
+  __gnu_test::test_members<double>();
+  __gnu_test::test_members<long double>();
+
+  __gnu_test::test_operator_members<float, float>();
+  __gnu_test::test_operator_members<float, double>();
+  __gnu_test::test_operator_members<float, long double>();
+  __gnu_test::test_operator_members<double, float>();
+  __gnu_test::test_operator_members<double, double>();
+  __gnu_test::test_operator_members<double, long double>();
+  __gnu_test::test_operator_members<long double, float>();
+  __gnu_test::test_operator_members<long double, double>();
+  __gnu_test::test_operator_members<long double, long double>();
+
+  // Test primary template.
+  __gnu_test::test_operator_members<__float128, __float128>();
+
+  return 0;
+}

libstdc++-v3/testsuite/26_numerics/complex/value_operations/more_constexpr.cc

+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+// Copyright (C) 2018 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <complex>
+#include <testsuite_common_types.h>
+
+namespace __gnu_test
+{
+  struct constexpr_functions
+  {
+    template<typename _Ttesttype>
+      void
+      operator()()
+      {
+	struct _Concept
+	{
+	  void __constraint()
+	  { 
+	    typedef typename _Ttesttype::_ComplexT _ComplexT;
+	    constexpr _ComplexT cc = { 1.1 };
+	    constexpr _Ttesttype a(cc);
+	    constexpr auto v1 [[maybe_unused]] = norm(a);
+	    constexpr auto v2 [[maybe_unused]] = conj(a);
+	  }
+	};
+
+	_Concept c;
+	c.__constraint();
+      }
+  };
+}
+
+int main()
+{
+  __gnu_test::constexpr_functions test;
+
+  test.operator()<std::complex<float>>();
+  test.operator()<std::complex<double>>();
+  test.operator()<std::complex<long double>>();
+
+  return 0;
+}

libstdc++-v3/testsuite/26_numerics/headers/complex/synopsis.cc

@@ -28,51 +28,71 @@ namespace std {
 
   // 26.2.6 operators:
   template<class T>
-    complex<T> operator+(const complex<T>&, const complex<T>&);
-  template<class T> complex<T> operator+(const complex<T>&, const T&);
-  template<class T> complex<T> operator+(const T&, const complex<T>&);
-  template<class T> complex<T> operator-
-    (const complex<T>&, const complex<T>&);
-  template<class T> complex<T> operator-(const complex<T>&, const T&);
-  template<class T> complex<T> operator-(const T&, const complex<T>&);
-  template<class T> complex<T> operator*
-    (const complex<T>&, const complex<T>&);
-  template<class T> complex<T> operator*(const complex<T>&, const T&);
-  template<class T> complex<T> operator*(const T&, const complex<T>&);
-  template<class T> complex<T> operator/
-    (const complex<T>&, const complex<T>&);
-  template<class T> complex<T> operator/(const complex<T>&, const T&);
-  template<class T> complex<T> operator/(const T&, const complex<T>&);
-  template<class T> complex<T> operator+(const complex<T>&);
-  template<class T> complex<T> operator-(const complex<T>&);
-  template<class T> _GLIBCXX_CONSTEXPR bool operator==
-    (const complex<T>&, const complex<T>&);
-  template<class T> _GLIBCXX_CONSTEXPR bool operator==
-    (const complex<T>&, const T&);
-  template<class T> _GLIBCXX_CONSTEXPR bool operator==
-    (const T&, const complex<T>&);
+    _GLIBCXX20_CONSTEXPR complex<T>
+    operator+(const complex<T>&, const complex<T>&);
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator+(const complex<T>&, const T&);
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator+(const T&, const complex<T>&);
 
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T>
+    operator-(const complex<T>&, const complex<T>&);
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator-(const complex<T>&, const T&);
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator-(const T&, const complex<T>&);
 
-  template<class T> _GLIBCXX_CONSTEXPR bool operator!=
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator*
     (const complex<T>&, const complex<T>&);
-  template<class T> _GLIBCXX_CONSTEXPR bool operator!=
-    (const complex<T>&, const T&);
-  template<class T> _GLIBCXX_CONSTEXPR bool operator!=
-    (const T&, const complex<T>&);
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator*(const complex<T>&, const T&);
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator*(const T&, const complex<T>&);
+
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T>
+    operator/(const complex<T>&, const complex<T>&);
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator/(const complex<T>&, const T&);
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator/(const T&, const complex<T>&);
+
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator+(const complex<T>&);
+  template<class T>
+    _GLIBCXX20_CONSTEXPR complex<T> operator-(const complex<T>&);
+
+  template<class T>
+    _GLIBCXX_CONSTEXPR bool operator==(const complex<T>&, const complex<T>&);
+  template<class T>
+     _GLIBCXX_CONSTEXPR bool operator==(const complex<T>&, const T&);
+  template<class T>
+    _GLIBCXX_CONSTEXPR bool operator==(const T&, const complex<T>&);
+
+  template<class T>
+    _GLIBCXX_CONSTEXPR bool operator!=(const complex<T>&, const complex<T>&);
+  template<class T>
+    _GLIBCXX_CONSTEXPR bool operator!=(const complex<T>&, const T&);
+  template<class T>
+    _GLIBCXX_CONSTEXPR bool operator!=(const T&, const complex<T>&);
+
   template<class T, class charT, class traits>
-  basic_istream<charT, traits>&
-  operator>>(basic_istream<charT, traits>&, complex<T>&);
+    basic_istream<charT, traits>&
+    operator>>(basic_istream<charT, traits>&, complex<T>&);
   template<class T, class charT, class traits>
-  basic_ostream<charT, traits>&
-  operator<<(basic_ostream<charT, traits>&, const complex<T>&);
+    basic_ostream<charT, traits>&
+    operator<<(basic_ostream<charT, traits>&, const complex<T>&);
 
   // 26.2.7 values:
   template<class T> _GLIBCXX_CONSTEXPR T real(const complex<T>&);
   template<class T> _GLIBCXX_CONSTEXPR T imag(const complex<T>&);
   template<class T> T abs(const complex<T>&);
-  template<class T> T arg(const complex<T>&);
-  template<class T> T norm(const complex<T>&);
-  template<class T> complex<T> conj(const complex<T>&);
+  template<class T> _GLIBCXX20_CONSTEXPR T arg(const complex<T>&);
+  template<class T> _GLIBCXX20_CONSTEXPR T norm(const complex<T>&);
+  template<class T> _GLIBCXX20_CONSTEXPR complex<T> conj(const complex<T>&);
+  template<class T> _GLIBCXX20_CONSTEXPR complex<T> proj(const complex<T>&);
   template<class T> complex<T> polar(const T& rho, const T& theta);
 
   // 26.2.8 transcendentals: