clang-tidy: pass by value

Found with modernize-pass-by-value

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/basicio.cpp

@@ -81,7 +81,7 @@ namespace Exiv2 {
     class FileIo::Impl {
     public:
         //! Constructor
-        Impl(const std::string& path);
+        Impl(std::string path);
 #ifdef EXV_UNICODE_PATH
         //! Constructor accepting a unicode path in an std::wstring
         Impl(const std::wstring& wpath);
@@ -141,16 +141,21 @@ namespace Exiv2 {
         Impl& operator=(const Impl& rhs) = delete;  //!< Assignment
     }; // class FileIo::Impl
 
-    FileIo::Impl::Impl(const std::string& path)
-        : path_(path),
+    FileIo::Impl::Impl(std::string path)
+        : path_(std::move(path)),
 #ifdef EXV_UNICODE_PATH
-        wpMode_(wpStandard),
+          wpMode_(wpStandard),
 #endif
-        fp_(0), opMode_(opSeek),
+          fp_(0),
+          opMode_(opSeek),
 #if defined WIN32 && !defined __CYGWIN__
-        hFile_(0), hMap_(0),
+          hFile_(0),
+          hMap_(0),
 #endif
-        pMappedArea_(0), mappedLength_(0), isMalloced_(false), isWriteable_(false)
+          pMappedArea_(0),
+          mappedLength_(0),
+          isMalloced_(false),
+          isWriteable_(false)
     {
     }
 

src/datasets.cpp

@@ -583,8 +583,7 @@ namespace Exiv2 {
 
     const char* IptcKey::familyName_ = "Iptc";
 
-    IptcKey::IptcKey(const std::string& key)
-        : key_(key)
+    IptcKey::IptcKey(std::string key) : key_(std::move(key))
     {
         decomposeKey();
     }

src/preview.cpp

@@ -1031,9 +1031,7 @@ namespace {
 // *****************************************************************************
 // class member definitions
 namespace Exiv2 {
-
-    PreviewImage::PreviewImage(const PreviewProperties& properties, DataBuf data)
-        : properties_(properties)
+    PreviewImage::PreviewImage(PreviewProperties properties, DataBuf data) : properties_(std::move(properties))
     {
         pData_ = data.pData_;
         size_ = data.size_;

src/properties.cpp

@@ -2447,13 +2447,11 @@ namespace Exiv2 {
         {"Xmp.plus.Reuse",                       EXV_PRINT_VOCABULARY(plusReuse)                      }
     };
 
-    XmpNsInfo::Ns::Ns(const std::string& ns)
-        : ns_(ns)
+    XmpNsInfo::Ns::Ns(std::string ns) : ns_(std::move(ns))
     {
     }
 
-    XmpNsInfo::Prefix::Prefix(const std::string& prefix)
-        : prefix_(prefix)
+    XmpNsInfo::Prefix::Prefix(std::string prefix) : prefix_(std::move(prefix))
     {
     }
 

src/tags.cpp

@@ -104,7 +104,7 @@ namespace Exiv2 {
 namespace Exiv2 {
 
     //! @cond IGNORE
-    GroupInfo::GroupName::GroupName(const std::string& groupName): g_(groupName)
+    GroupInfo::GroupName::GroupName(std::string groupName) : g_(std::move(groupName))
     {
     }
     //! @endcond

src/tiffvisitor_int.cpp

@@ -555,17 +555,10 @@ namespace Exiv2 {
         decodeTiffEntry(object);
     }
 
-    TiffEncoder::TiffEncoder(
-            const ExifData&      exifData,
-            const IptcData&      iptcData,
-            const XmpData&       xmpData,
-                  TiffComponent* pRoot,
-            const bool           isNewImage,
-            const PrimaryGroups* pPrimaryGroups,
-            const TiffHeaderBase* pHeader,
-                  FindEncoderFct findEncoderFct
-    )
-        : exifData_(exifData),
+    TiffEncoder::TiffEncoder(ExifData exifData, const IptcData& iptcData, const XmpData& xmpData, TiffComponent* pRoot,
+                             const bool isNewImage, const PrimaryGroups* pPrimaryGroups, const TiffHeaderBase* pHeader,
+                             FindEncoderFct findEncoderFct)
+        : exifData_(std::move(exifData)),
           iptcData_(iptcData),
           xmpData_(xmpData),
           del_(true),

src/tiffvisitor_int.hpp

@@ -383,16 +383,9 @@ namespace Exiv2 {
                  to, the image with the metadata to encode and a function to
                  find special encoders.
          */
-        TiffEncoder(
-            const ExifData&      exifData,
-            const IptcData&      iptcData,
-            const XmpData&       xmpData,
-                  TiffComponent* pRoot,
-            const bool           isNewImage,
-            const PrimaryGroups* pPrimaryGroups,
-            const TiffHeaderBase* pHeader,
-                  FindEncoderFct findEncoderFct
-        );
+        TiffEncoder(ExifData exifData, const IptcData& iptcData, const XmpData& xmpData, TiffComponent* pRoot,
+                    const bool isNewImage, const PrimaryGroups* pPrimaryGroups, const TiffHeaderBase* pHeader,
+                    FindEncoderFct findEncoderFct);
         //! Virtual destructor
         virtual ~TiffEncoder() = default;
         //@}