fix clang tidy warnings

alib2algo/src/regexp/generate/RandomRegExpFactory.cpp

@@ -107,7 +107,7 @@ ext::ptr_value < regexp::UnboundedRegExpElement < SymbolType > > RandomRegExpFac
 		childNodes = childNodes > n ? n : childNodes;
-		int subSizes[4];
+		int subSizes[4] = {0};
 		if(childNodes == 4) {
 			subSizes[3] = ext::random_devices::semirandom() % ( n - 1 );
 			subSizes[2] = ext::random_devices::semirandom() % ( n - subSizes[3] - 1 );

alib2std/src/extensions/fdstream.hpp

@@ -73,7 +73,7 @@ extern const int FAIL_FD;
  * Class representing buffered stream designed to work on defined file descriptor instead of usual file name.
  *
  */
-class fdstreambuf : public std::streambuf {
+class fdstreambuf final : public std::streambuf {
 	/**
 	 * \brief
 	 * The size of the internal buffer.

aql2/src/prompt/ReadlineCharSequence.h

@@ -17,7 +17,7 @@
 #include <lexer/CharSequenceBase.h>
-class ReadlineCharSequence : public cli::CharSequenceBase {
+class ReadlineCharSequence final : public cli::CharSequenceBase {
 	std::vector < std::string > m_lines;
 	bool first = true;
 	bool forceReadLine = false;