[core] publish alias since used as args or ret values of public functions

Solution by grasph

Fixes #20572

Author: ferdymercury

core/cont/inc/TList.h

@@ -38,9 +38,9 @@ class TListIter;
 class TList : public TSeqCollection {
 
 friend  class TListIter;
-
-protected:
+public:
    using TObjLinkPtr_t = std::shared_ptr<TObjLink>;
+protected:
    using TObjLinkWeakPtr_t = std::weak_ptr<TObjLink>;
 
    TObjLinkPtr_t     fFirst;     //! pointer to first entry in linked list
@@ -121,9 +121,9 @@ friend  class TListIter;
 class TObjLink : public std::enable_shared_from_this<TObjLink> {
 
 friend class TList;
-
-private:
+public:
    using TObjLinkPtr_t = std::shared_ptr<TObjLink>;
+private:
    using TObjLinkWeakPtr_t = std::weak_ptr<TObjLink>;
 
    TObjLinkPtr_t     fNext;

core/meta/inc/TFileMergeInfo.h

@@ -39,9 +39,9 @@ class TIOFeatures;
 }
 
 class TFileMergeInfo {
-private:
+public:
    using TIOFeatures = ROOT::TIOFeatures;
-
+private:
    TFileMergeInfo() = delete;
    TFileMergeInfo(const TFileMergeInfo&) = delete;
    TFileMergeInfo& operator=(const TFileMergeInfo&) = delete;

geom/geom/inc/TGeoTessellated.h

@@ -18,6 +18,7 @@
 #include "TGeoBBox.h"
 
 class TGeoFacet {
+public:
    using Vertex_t = Tessellated::Vertex_t;
    using VertexVec_t = Tessellated::VertexVec_t;
 

tree/tree/inc/TBranch.h

@@ -91,6 +91,7 @@ class TBulkBranchRead {
 }
 
 class TBranch : public TNamed, public TAttFill {
+public:
    using TIOFeatures = ROOT::TIOFeatures;
 
 protected:

tree/tree/inc/TLeaf.h

@@ -60,9 +60,12 @@ class TLeaf : public TNamed {
 
    virtual Int_t GetOffsetHeaderSize() const {return 0;}
 
-protected:
+public:
 
    using Counts_t = std::vector<Int_t>;
+
+protected:
+
    struct LeafCountValues {
       Counts_t fValues;
       Long64_t fStartEntry{-1}; ///<! entry number of corresponding to element 0 of the vector.