fix operator < in strings

alib2data/src/string/CyclicString.cpp

@@ -101,7 +101,7 @@ bool CyclicString::operator<(const LinearString& other) const {
 }
 bool CyclicString::operator<(const CyclicString& other) const {
-	return m_Data < other.m_Data;
+	return std::tie(m_Data, alphabet) < std::tie(other.m_Data, other.alphabet);
 }
 bool CyclicString::operator<(const Epsilon& other) const {

alib2data/src/string/Epsilon.cpp

@@ -50,8 +50,8 @@ bool Epsilon::isEmpty() const {
 	return true;
 }
-bool Epsilon::operator<(const Epsilon&) const {
-	return false;
+bool Epsilon::operator<(const Epsilon& other) const {
+	return alphabet < other.alphabet;
 }
 bool Epsilon::operator<(const LinearString& other) const {

alib2data/src/string/LinearString.cpp

@@ -101,7 +101,7 @@ bool LinearString::isEmpty() const {
 }
 bool LinearString::operator<(const LinearString& other) const {
-	return m_Data < other.m_Data;
+	return std::tie(m_Data, alphabet) < std::tie(other.m_Data, other.alphabet);
 }
 bool LinearString::operator<(const CyclicString& other) const {