core: std::string more changes

modules/core/include/opencv2/core/cvstd.hpp

@@ -452,6 +452,39 @@ class CV_EXPORTS FileNode; //for string constructor from FileNode
 
 typedef std::string String;
 
+#ifndef OPENCV_DISABLE_STRING_LOWER_UPPER_CONVERSIONS
+
+//! @cond IGNORED
+namespace details {
+// std::tolower is int->int
+static inline char char_tolower(char ch)
+{
+    return (char)std::tolower((int)ch);
+}
+// std::toupper is int->int
+static inline char char_toupper(char ch)
+{
+    return (char)std::toupper((int)ch);
+}
+} // namespace details
+//! @endcond
+
+static inline std::string toLowerCase(const std::string& str)
+{
+    std::string result(str);
+    std::transform(result.begin(), result.end(), result.begin(), details::char_tolower);
+    return result;
+}
+
+static inline std::string toUpperCase(const std::string& str)
+{
+    std::string result(str);
+    std::transform(result.begin(), result.end(), result.begin(), details::char_toupper);
+    return result;
+}
+
+#endif // OPENCV_DISABLE_STRING_LOWER_UPPER_CONVERSIONS
+
 //! @} core_basic
 } // cv
 

modules/core/include/opencv2/core/persistence.hpp

@@ -719,7 +719,6 @@ CV_EXPORTS void writeScalar( FileStorage& fs, const String& value );
 CV_EXPORTS void read(const FileNode& node, int& value, int default_value);
 CV_EXPORTS void read(const FileNode& node, float& value, float default_value);
 CV_EXPORTS void read(const FileNode& node, double& value, double default_value);
-CV_EXPORTS void read(const FileNode& node, String& value, const String& default_value);
 CV_EXPORTS void read(const FileNode& node, std::string& value, const std::string& default_value);
 CV_EXPORTS void read(const FileNode& node, Mat& mat, const Mat& default_mat = Mat() );
 CV_EXPORTS void read(const FileNode& node, SparseMat& mat, const SparseMat& default_mat = SparseMat() );

modules/core/src/command_line_parser.cpp

@@ -72,14 +72,9 @@ static const char* get_type_name(int type)
     return "unknown";
 }
 
-// std::tolower is int->int
-static char char_tolower(char ch)
-{
-    return (char)std::tolower((int)ch);
-}
 static bool parse_bool(std::string str)
 {
-    std::transform(str.begin(), str.end(), str.begin(), char_tolower);
+    std::transform(str.begin(), str.end(), str.begin(), details::char_tolower);
     std::istringstream is(str);
     bool b;
     is >> (str.size() > 1 ? std::boolalpha : std::noboolalpha) >> b;

modules/core/src/ocl.cpp

@@ -1691,11 +1691,6 @@ static cl_device_id selectOpenCLDevice()
     return NULL;
 }
 #else
-// std::tolower is int->int
-static char char_tolower(char ch)
-{
-    return (char)std::tolower((int)ch);
-}
 static cl_device_id selectOpenCLDevice()
 {
     std::string platform, deviceName;
@@ -1780,7 +1775,7 @@ static cl_device_id selectOpenCLDevice()
     {
         int deviceType = 0;
         std::string tempStrDeviceType = deviceTypes[t];
-        std::transform(tempStrDeviceType.begin(), tempStrDeviceType.end(), tempStrDeviceType.begin(), char_tolower);
+        std::transform(tempStrDeviceType.begin(), tempStrDeviceType.end(), tempStrDeviceType.begin(), details::char_tolower);
 
         if (tempStrDeviceType == "gpu" || tempStrDeviceType == "dgpu" || tempStrDeviceType == "igpu")
             deviceType = Device::TYPE_GPU;

modules/core/src/persistence_cpp.cpp

@@ -667,11 +667,6 @@ void read(const FileNode& node, double& value, double default_value)
         CV_NODE_IS_REAL(node.node->tag) ? node.node->data.f : std::numeric_limits<double>::max();
 }
 
-void read(const FileNode& node, String& value, const String& default_value)
-{
-    value = !node.node ? default_value : CV_NODE_IS_STRING(node.node->tag) ? String(node.node->data.str.ptr) : String();
-}
-
 void read(const FileNode& node, std::string& value, const std::string& default_value)
 {
     value = !node.node ? default_value : CV_NODE_IS_STRING(node.node->tag) ? std::string(node.node->data.str.ptr) : default_value;

modules/core/src/system.cpp

@@ -1970,7 +1970,7 @@ public:
             const Ipp64u minorFeatures = 0;
 #endif
 
-            env = env.toLowerCase();
+            env = toLowerCase(env);
             if(env.substr(0, 2) == "ne")
             {
                 useIPP_NE = true;