Merge #13282: trivial: Mark overrides as such.

60ebc7d trivial: Mark overrides as such. (Daniel Kraft)

Pull request description:

  This trivial change adds the `override` keyword to some methods that override virtual base class / interface methods.  This ensures that any future changes to the interface's method signatures which are not correctly mirrored in the subclasses will break at compile time with a clear error message, rather than at runtime.

Tree-SHA512: cc1bfa5f03b5e29d20e3eab07b0b5fa2f77b47f79e08263dbff43e4f463e9dd8f4f537e2c8c9b6cb3663220dcf40cfd77723cd9fcbd623c9efc90a4cd44facfc

Author: MarcoFalke

src/bench/bench.h

@@ -111,19 +111,19 @@ class Printer
 class ConsolePrinter : public Printer
 {
 public:
-    void header();
-    void result(const State& state);
-    void footer();
+    void header() override;
+    void result(const State& state) override;
+    void footer() override;
 };
 
 // creates box plot with plotly.js
 class PlotlyPrinter : public Printer
 {
 public:
     PlotlyPrinter(std::string plotly_url, int64_t width, int64_t height);
-    void header();
-    void result(const State& state);
-    void footer();
+    void header() override;
+    void result(const State& state) override;
+    void footer() override;
 
 private:
     std::string m_plotly_url;

src/test/validation_block_tests.cpp

@@ -25,20 +25,20 @@ struct TestSubscriber : public CValidationInterface {
 
     TestSubscriber(uint256 tip) : m_expected_tip(tip) {}
 
-    void UpdatedBlockTip(const CBlockIndex* pindexNew, const CBlockIndex* pindexFork, bool fInitialDownload)
+    void UpdatedBlockTip(const CBlockIndex* pindexNew, const CBlockIndex* pindexFork, bool fInitialDownload) override
     {
         BOOST_CHECK_EQUAL(m_expected_tip, pindexNew->GetBlockHash());
     }
 
-    void BlockConnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* pindex, const std::vector<CTransactionRef>& txnConflicted)
+    void BlockConnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* pindex, const std::vector<CTransactionRef>& txnConflicted) override
     {
         BOOST_CHECK_EQUAL(m_expected_tip, block->hashPrevBlock);
         BOOST_CHECK_EQUAL(m_expected_tip, pindex->pprev->GetBlockHash());
 
         m_expected_tip = block->GetHash();
     }
 
-    void BlockDisconnected(const std::shared_ptr<const CBlock>& block)
+    void BlockDisconnected(const std::shared_ptr<const CBlock>& block) override
     {
         BOOST_CHECK_EQUAL(m_expected_tip, block->GetHash());