refactor: Drop no longer used swap member functions

src/test/checkqueue_tests.cpp

@@ -43,7 +43,6 @@ struct FakeCheck {
     {
         return true;
     }
-    void swap(FakeCheck& x) noexcept {};
 };
 
 struct FakeCheckCheckCompletion {
@@ -53,7 +52,6 @@ struct FakeCheckCheckCompletion {
         n_calls.fetch_add(1, std::memory_order_relaxed);
         return true;
     }
-    void swap(FakeCheckCheckCompletion& x) noexcept {};
 };
 
 struct FailingCheck {
@@ -64,10 +62,6 @@ struct FailingCheck {
     {
         return !fails;
     }
-    void swap(FailingCheck& x) noexcept
-    {
-        std::swap(fails, x.fails);
-    };
 };
 
 struct UniqueCheck {
@@ -82,10 +76,6 @@ struct UniqueCheck {
         results.insert(check_id);
         return true;
     }
-    void swap(UniqueCheck& x) noexcept
-    {
-        std::swap(x.check_id, check_id);
-    };
 };
 
 
@@ -113,10 +103,6 @@ struct MemoryCheck {
     {
         fake_allocated_memory.fetch_sub(b, std::memory_order_relaxed);
     };
-    void swap(MemoryCheck& x) noexcept
-    {
-        std::swap(b, x.b);
-    };
 };
 
 struct FrozenCleanupCheck {
@@ -151,10 +137,6 @@ struct FrozenCleanupCheck {
         other.should_freeze = false;
         return *this;
     }
-    void swap(FrozenCleanupCheck& x) noexcept
-    {
-        std::swap(should_freeze, x.should_freeze);
-    };
 };
 
 // Static Allocations

src/validation.h

@@ -328,17 +328,6 @@ public:
 
     bool operator()();
 
-    void swap(CScriptCheck& check) noexcept
-    {
-        std::swap(ptxTo, check.ptxTo);
-        std::swap(m_tx_out, check.m_tx_out);
-        std::swap(nIn, check.nIn);
-        std::swap(nFlags, check.nFlags);
-        std::swap(cacheStore, check.cacheStore);
-        std::swap(error, check.error);
-        std::swap(txdata, check.txdata);
-    }
-
     ScriptError GetScriptError() const { return error; }
 };