Remove using namespace declarations at namespace scope in headers

src/test/app/Check_test.cpp

@@ -335,6 +335,7 @@ class Check_test : public beast::unit_test::suite
         // expected interaction between these optional fields; other than
         // the expiration, they are just plopped into the ledger.  So I'm
         // not looking at interactions.
+        using namespace std::chrono_literals;
         std::size_t const aliceCount {checksOnAccount (env, alice).size()};
         std::size_t const bobCount   {checksOnAccount (env,   bob).size()};
         env (check::create (alice, bob, USD(50)), expiration (env.now() + 1s));
@@ -540,6 +541,7 @@ class Check_test : public beast::unit_test::suite
             expiration (env.now()), ter (tecEXPIRED));
         env.close();
 
+        using namespace std::chrono_literals;
         env (check::create (alice, bob, USD(50)), expiration (env.now() + 1s));
         env.close();
 
@@ -1341,6 +1343,7 @@ class Check_test : public beast::unit_test::suite
         env (check::create (alice, bob, XRP(10)));
         env.close();
 
+        using namespace std::chrono_literals;
         uint256 const chkIdExp {getCheckIndex (alice, env.seq (alice))};
         env (check::create (alice, bob, XRP(10)), expiration (env.now() + 1s));
         env.close();
@@ -1615,6 +1618,7 @@ class Check_test : public beast::unit_test::suite
         env.close();
 
         // Three checks that expire in 10 minutes.
+        using namespace std::chrono_literals;
         uint256 const chkIdNotExp1 {getCheckIndex (alice, env.seq (alice))};
         env (check::create (alice, bob, XRP(10)), expiration (env.now()+600s));
         env.close();

src/test/app/Path_test.cpp

@@ -259,6 +259,7 @@ public:
                 g.signal();
             });
 
+        using namespace std::chrono_literals;
         BEAST_EXPECT(g.wait_for(5s));
         BEAST_EXPECT(! result.isMember(jss::error));
         return result;

src/test/app/RCLValidations_test.cpp

@@ -101,6 +101,7 @@ class RCLValidations_test : public beast::unit_test::suite
         std::vector<std::shared_ptr<Ledger const>> altHistory(
             history.begin(), history.begin() + diverge);
         // advance clock to get new ledgers
+        using namespace std::chrono_literals;
         env.timeKeeper().set(env.timeKeeper().now() + 1200s);
         prev = altHistory.back();
         bool forceHash = true;

src/test/app/Ticket_test.cpp

@@ -277,6 +277,7 @@ class Ticket_test : public beast::unit_test::suite
         Env env {*this, supported_amendments().set(featureTickets)};
 
         // create and verify
+        using namespace std::chrono_literals;
         uint32_t expire =
             (env.timeKeeper ().closeTime () + 60s)
             .time_since_epoch ().count ();

src/test/app/TrustAndBalance_test.cpp

@@ -265,6 +265,7 @@ class TrustAndBalance_test : public beast::unit_test::suite
 
             env.close();
 
+            using namespace std::chrono_literals;
             BEAST_EXPECT(wsc->findMsg(5s,
                 [](auto const& jv)
                 {
@@ -470,6 +471,7 @@ class TrustAndBalance_test : public beast::unit_test::suite
             "00000000DEADBEEF");
         env.close();
 
+        using namespace std::chrono_literals;
         BEAST_EXPECT(wsc->findMsg(2s,
             [](auto const& jv)
             {

src/test/app/TxQ_test.cpp

@@ -145,6 +145,7 @@ class TxQ_test : public beast::unit_test::suite
 
         // Close the ledger with a delay to force the TxQ stats
         // to stay at the default.
+        using namespace std::chrono_literals;
         env.close(env.now() + 5s, 10000ms);
         checkMetrics(env, 0,
             2 * (ripple::detail::supportedAmendments().size() + 1),
@@ -2463,6 +2464,7 @@ public:
         checkMetrics(env, 0, boost::none, 4, 3, 256);
 
         // First transaction establishes the messaging
+        using namespace std::chrono_literals;
         BEAST_EXPECT(wsc->findMsg(5s,
             [&](auto const& jv)
         {

src/test/app/ValidatorList_test.cpp

@@ -409,6 +409,7 @@ private:
                 manifest1, expiredblob, expiredSig, version));
 
         // apply single list
+        using namespace std::chrono_literals;
         NetClock::time_point const expiration =
             env.timeKeeper().now() + 3600s;
         auto const blob1 = makeList (
@@ -764,6 +765,7 @@ private:
             // do not apply expired list
             auto const version = 1;
             auto const sequence = 1;
+            using namespace std::chrono_literals;
             NetClock::time_point const expiration =
                 env.timeKeeper().now() + 60s;
             auto const blob = makeList (
@@ -929,6 +931,7 @@ private:
 
                 auto const version = 1;
                 auto const sequence = 1;
+                using namespace std::chrono_literals;
                 NetClock::time_point const expiration =
                     env.timeKeeper().now() + 3600s;
                 auto const blob = makeList (
@@ -1011,6 +1014,7 @@ private:
                 NetClock::time_point expiration;
             };
 
+            using namespace std::chrono_literals;
             auto addPublishedList = [this, &env, &trustedKeys, &validators]()
             {
                 auto const publisherSecret = randomSecretKey();

src/test/app/ValidatorSite_test.cpp

@@ -174,6 +174,7 @@ private:
 
         auto const sequence = 1;
         auto const version = 1;
+        using namespace std::chrono_literals;
         NetClock::time_point const expiration =
             env.timeKeeper().now() + 3600s;