[gcc r11-8909] libstdc++: Simplify definition of net::ip::resolver_base constants

[Jonathan Wakely]

https://gcc.gnu.org/g:edcf1b0de47e503fd7afe7095bfdffbe9475f13f

commit r11-8909-gedcf1b0de47e503fd7afe7095bfdffbe9475f13f
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Apr 26 21:16:20 2021 +0100

    libstdc++: Simplify definition of net::ip::resolver_base constants
    
    libstdc++-v3/ChangeLog:
    
            * include/experimental/internet (resolver_base::flags): Remove
            enumerators. Initialize constants directly with desired values.
            Make all operators constexpr and noexcept.
            * testsuite/experimental/net/internet/resolver/base.cc: Use
            __gnu_test::test_bitmask_values for bitmask type. Check
            construction and destruction is protected.
    
    (cherry picked from commit 49adc066729bda093b0658e3926bbf64cd4628b3)

Diff:
---
 libstdc++-v3/include/experimental/internet         | 49 ++++++++-----------
 .../experimental/net/internet/resolver/base.cc     | 56 +++++++---------------
 2 files changed, 37 insertions(+), 68 deletions(-)

diff --git a/libstdc++-v3/include/experimental/internet b/libstdc++-v3/include/experimental/internet
index cd19de59e70..d3321afb9c6 100644
--- a/libstdc++-v3/include/experimental/internet
+++ b/libstdc++-v3/include/experimental/internet
@@ -1649,27 +1649,16 @@ namespace ip
   class resolver_base
   {
   public:
-    enum flags : int
-    {
-      __flags_passive			= AI_PASSIVE,
-      __flags_canonical_name		= AI_CANONNAME,
-      __flags_numeric_host		= AI_NUMERICHOST,
-#ifdef AI_NUMERICSERV
-      __flags_numeric_service		= AI_NUMERICSERV,
-#endif
-      __flags_v4_mapped			= AI_V4MAPPED,
-      __flags_all_matching		= AI_ALL,
-      __flags_address_configured	= AI_ADDRCONFIG
-    };
-    static constexpr flags passive		= __flags_passive;
-    static constexpr flags canonical_name	= __flags_canonical_name;
-    static constexpr flags numeric_host		= __flags_numeric_host;
+    enum flags : int { };
+    static constexpr flags passive		= (flags)AI_PASSIVE;
+    static constexpr flags canonical_name	= (flags)AI_CANONNAME;
+    static constexpr flags numeric_host		= (flags)AI_NUMERICHOST;
 #ifdef AI_NUMERICSERV
-    static constexpr flags numeric_service	= __flags_numeric_service;
+    static constexpr flags numeric_service	= (flags)AI_NUMERICSERV;
 #endif
-    static constexpr flags v4_mapped		= __flags_v4_mapped;
-    static constexpr flags all_matching		= __flags_all_matching;
-    static constexpr flags address_configured	= __flags_address_configured;
+    static constexpr flags v4_mapped		= (flags)AI_V4MAPPED;
+    static constexpr flags all_matching		= (flags)AI_ALL;
+    static constexpr flags address_configured	= (flags)AI_ADDRCONFIG;
 
   protected:
     resolver_base() = default;
@@ -1677,34 +1666,34 @@ namespace ip
   };
 
   constexpr resolver_base::flags
-  operator&(resolver_base::flags __f1, resolver_base::flags __f2)
+  operator&(resolver_base::flags __f1, resolver_base::flags __f2) noexcept
   { return resolver_base::flags( int(__f1) & int(__f2) ); }
 
   constexpr resolver_base::flags
-  operator|(resolver_base::flags __f1, resolver_base::flags __f2)
+  operator|(resolver_base::flags __f1, resolver_base::flags __f2) noexcept
   { return resolver_base::flags( int(__f1) | int(__f2) ); }
 
   constexpr resolver_base::flags
-  operator^(resolver_base::flags __f1, resolver_base::flags __f2)
+  operator^(resolver_base::flags __f1, resolver_base::flags __f2) noexcept
   { return resolver_base::flags( int(__f1) ^ int(__f2) ); }
 
   constexpr resolver_base::flags
-  operator~(resolver_base::flags __f)
+  operator~(resolver_base::flags __f) noexcept
   { return resolver_base::flags( ~int(__f) ); }
 
-  inline resolver_base::flags&
-  operator&=(resolver_base::flags& __f1, resolver_base::flags __f2)
+  constexpr resolver_base::flags&
+  operator&=(resolver_base::flags& __f1, resolver_base::flags __f2) noexcept
   { return __f1 = (__f1 & __f2); }
 
-  inline resolver_base::flags&
-  operator|=(resolver_base::flags& __f1, resolver_base::flags __f2)
+  constexpr resolver_base::flags&
+  operator|=(resolver_base::flags& __f1, resolver_base::flags __f2) noexcept
   { return __f1 = (__f1 | __f2); }
 
-  inline resolver_base::flags&
-  operator^=(resolver_base::flags& __f1, resolver_base::flags __f2)
+  constexpr resolver_base::flags&
+  operator^=(resolver_base::flags& __f1, resolver_base::flags __f2) noexcept
   { return __f1 = (__f1 ^ __f2); }
 
-  // TODO define resolver_base::flags static constants for C++14 mode
+  // TODO define resolver_base::flags static constants in .so for C++14 mode
 
   /// @}
 
diff --git a/libstdc++-v3/testsuite/experimental/net/internet/resolver/base.cc b/libstdc++-v3/testsuite/experimental/net/internet/resolver/base.cc
index c9efd642ca9..23af4464b72 100644
--- a/libstdc++-v3/testsuite/experimental/net/internet/resolver/base.cc
+++ b/libstdc++-v3/testsuite/experimental/net/internet/resolver/base.cc
@@ -15,50 +15,30 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-do run { target c++14 } }
+// { dg-do compile { target c++14 } }
 // { dg-add-options net_ts }
 
 #include <experimental/internet>
+#include <testsuite_common_types.h>
 #include <testsuite_hooks.h>
 
-void
-test01()
-{
-  bool test __attribute__((unused)) = false;
+using std::experimental::net::ip::resolver_base;
 
-  using resolver = std::experimental::net::ip::resolver_base;
-
-  resolver::flags f = resolver::passive;
-
-  VERIFY( (f & resolver::numeric_host) == 0);
-  f &= resolver::numeric_host;
-  VERIFY( f == 0 );
-
-  VERIFY( (f | resolver::numeric_host) == resolver::numeric_host);
-  f |= resolver::numeric_host;
-  VERIFY( f == resolver::numeric_host );
-
-  VERIFY( (f ^ resolver::numeric_host) == 0 );
-  f ^= resolver::numeric_host;
-  VERIFY( f == 0 );
-
-  f = ~resolver::numeric_host;
-  VERIFY( (f & resolver::numeric_host) == 0);
-  VERIFY( (f | resolver::numeric_host) == ~resolver::flags{} );
-
-  (void) resolver::passive;
-  (void) resolver::canonical_name;
-  (void) resolver::numeric_host;
+static_assert( __gnu_test::test_bitmask_values({
+  resolver_base::passive,
+  resolver_base::canonical_name,
+  resolver_base::numeric_host,
 #ifdef AI_NUMERICSERV
-  (void) resolver::numeric_service;
+  resolver_base::numeric_service,
 #endif
-  (void) resolver::v4_mapped;
-  (void) resolver::all_matching;
-  (void) resolver::address_configured;
-}
+  resolver_base::v4_mapped,
+  resolver_base::all_matching,
+  resolver_base::address_configured
+}), "each bitmask element is distinct" );
+
+static_assert( ! std::is_default_constructible<resolver_base>(), "protected" );
+static_assert( ! std::is_destructible<resolver_base>(), "protected" );
 
-int
-main()
-{
-  test01();
-}
+struct Res : resolver_base { };
+static_assert( std::is_default_constructible<Res>(), "" );
+static_assert( std::is_destructible<Res>(), "" );