Fix splitString()/splitStringSimple() for case of empty trailing part

CMakeLists.txt

@@ -114,7 +114,7 @@ set(META_APP_DESCRIPTION "Useful C++ classes and routines such as argument parse
 set(META_FEATURES_FOR_COMPILER_DETECTION_HEADER cxx_thread_local)
 set(META_VERSION_MAJOR 5)
 set(META_VERSION_MINOR 10)
-set(META_VERSION_PATCH 2)
+set(META_VERSION_PATCH 3)
 
 # find required 3rd party libraries
 include(3rdParty)

conversion/stringconversion.h

@@ -161,7 +161,8 @@ Container splitString(Detail::StringParamForContainer<Container> string, Detail:
     Container res;
     typename Container::value_type *last = nullptr;
     bool merge = false;
-    for (typename Container::value_type::size_type i = 0, end = string.size(), delimPos; i < end; i = delimPos + delimiter.size()) {
+    typename Container::value_type::size_type i = 0, end = string.size();
+    for (typename Container::value_type::size_type delimPos; i < end; i = delimPos + delimiter.size()) {
         delimPos = string.find(delimiter, i);
         if (!merge && maxParts >= 0 && res.size() == static_cast<typename Container::value_type::size_type>(maxParts)) {
             if (delimPos == i && emptyPartsRole == EmptyPartsTreat::Merge) {
@@ -189,6 +190,9 @@ Container splitString(Detail::StringParamForContainer<Container> string, Detail:
             }
         }
     }
+    if (i == end && emptyPartsRole == EmptyPartsTreat::Keep) {
+        res.emplace_back();
+    }
     return res;
 }
 
@@ -207,7 +211,8 @@ Container splitStringSimple(
 {
     --maxParts;
     Container res;
-    for (typename Container::value_type::size_type i = 0, end = string.size(), delimPos; i < end; i = delimPos + delimiter.size()) {
+    typename Container::value_type::size_type i = 0, end = string.size();
+    for (typename Container::value_type::size_type delimPos; i < end; i = delimPos + delimiter.size()) {
         delimPos = string.find(delimiter, i);
         if (maxParts >= 0 && res.size() == static_cast<typename Container::value_type::size_type>(maxParts)) {
             delimPos = Container::value_type::npos;
@@ -223,6 +228,17 @@ Container splitStringSimple(
         } else {
             res.emplace(string.data() + i, delimPos - i);
         }
+#endif
+    }
+    if (i == end) {
+#if __cplusplus >= 201709
+        if constexpr (requires { res.emplace_back(); }) {
+#endif
+            res.emplace_back();
+#if __cplusplus >= 201709
+        } else {
+            res.emplace();
+        }
 #endif
     }
     return res;

tests/conversiontests.cpp

@@ -295,6 +295,11 @@ void ConversionTests::testStringConversions()
     CPPUNIT_ASSERT_EQUAL(splitTestExpected, splitTestActual);
     splitTestActual = splitStringSimple<vector<string>>("1,2,3"s, ","s, 2);
     CPPUNIT_ASSERT_EQUAL(splitTestExpected, splitTestActual);
+    splitTestExpected = { "12", "34", "56", "" };
+    splitTestActual = splitString<vector<string>>("12,34,56,"s, ","s);
+    CPPUNIT_ASSERT_EQUAL(splitTestExpected, splitTestActual);
+    splitTestActual = splitStringSimple<vector<string>>("12,34,56,"s, ","s);
+    CPPUNIT_ASSERT_EQUAL(splitTestExpected, splitTestActual);
     splitTestExpected = { "1", "2,3", "4,,5" };
     splitTestActual = splitString<vector<string>>("1,2,,3,4,,5"s, ","s, EmptyPartsTreat::Merge, 3);
     CPPUNIT_ASSERT_EQUAL(splitTestExpected, splitTestActual);