no need declare these tag structs separately

Change-Id: I00f336ee4eced431155c79bee6e2373e145ae95c
Reviewed-on: https://gerrit.libreoffice.org/54780Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/i18nlangtag/lang.h

@@ -83,8 +83,8 @@
 #include <sal/types.h>
 #include <o3tl/strong_int.hxx>
 #include <ostream>
-struct LanguageTypeTag {};
-typedef o3tl::strong_int<sal_uInt16, LanguageTypeTag> LanguageType;
+
+typedef o3tl::strong_int<sal_uInt16, struct LanguageTypeTag> LanguageType;
 inline std::ostream& operator<<(std::ostream& os, LanguageType const & lt) { os << sal_uInt16(lt); return os; }
 constexpr LanguageType primary(LanguageType lt) { return LanguageType(sal_uInt16(lt) & 0x03ff); }
 

include/o3tl/strong_int.hxx

@@ -75,8 +75,7 @@ isInRange(T2 value) {
 /// Wrap up an integer type so that we prevent accidental conversion to other integer types.
 ///
 /// e.g.
-///   struct MyIntTag {};
-///   typedef o3tl::strong_int<unsigned, MyIntTag> MyInt;
+///   typedef o3tl::strong_int<unsigned, struct MyIntTag> MyInt;
 ///
 /// \param UNDERLYING_TYPE the underlying scalar type
 /// \param PHANTOM_TYPE    a type tag, used to distinguish this instantiation of the template

include/sfx2/shell.hxx

@@ -66,8 +66,7 @@ namespace svl
     Id for <SfxInterface>s, gives a quasi-static access to the interface
     through an array to <SfxApplication>.
 */
-struct SfxInterfaceIdTag {};
-typedef o3tl::strong_int<sal_uInt16, SfxInterfaceIdTag> SfxInterfaceId;
+typedef o3tl::strong_int<sal_uInt16, struct SfxInterfaceIdTag> SfxInterfaceId;
 
 constexpr auto SFX_INTERFACE_NONE         = SfxInterfaceId(0);
 constexpr auto SFX_INTERFACE_SFXAPP       = SfxInterfaceId(1);

include/svl/undo.hxx

@@ -29,8 +29,7 @@
 
 struct MarkedUndoAction;
 
-struct ViewShellIdTag;
-typedef o3tl::strong_int<sal_Int32, ViewShellIdTag> ViewShellId;
+typedef o3tl::strong_int<sal_Int32, struct ViewShellIdTag> ViewShellId;
 
 class SVL_DLLPUBLIC SfxRepeatTarget
 {

include/svx/svdtypes.hxx

@@ -56,8 +56,7 @@ enum class SdrDragMode
 // You can use this value in the methods of SdrLayerSet, but false is returned
 // every time or the method does nothing.
 // type declaration for Layer-IDs
-struct SdrLayerIDTag {};
-typedef o3tl::strong_int<sal_uInt8,SdrLayerIDTag> SdrLayerID;
+typedef o3tl::strong_int<sal_uInt8, struct SdrLayerIDTag> SdrLayerID;
 
 // If there is no layer when it should be identified, then
 // SdrLayerAdmin::GetLayerID(const String&) returns a value.