Replace boost::variant with std::variant

src/key_io.cpp

@@ -8,16 +8,12 @@
 #include <bech32.h>
 #include <util/strencodings.h>
 
-#include <boost/variant/apply_visitor.hpp>
-#include <boost/variant/static_visitor.hpp>
-
+#include <algorithm>
 #include <assert.h>
 #include <string.h>
-#include <algorithm>
 
-namespace
-{
-class DestinationEncoder : public boost::static_visitor<std::string>
+namespace {
+class DestinationEncoder
 {
 private:
     const CChainParams& m_params;
@@ -209,7 +205,7 @@ std::string EncodeExtKey(const CExtKey& key)
 
 std::string EncodeDestination(const CTxDestination& dest)
 {
-    return boost::apply_visitor(DestinationEncoder(Params()), dest);
+    return std::visit(DestinationEncoder(Params()), dest);
 }
 
 CTxDestination DecodeDestination(const std::string& str)