[gtkmm] gtk/gtkmm/*.h: Export class selectively as needed

[Chun-wei Fan <fanchunwei src gnome org>]

commit 4c5a13030b09bfcf345920a3b40165e209b690f6
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue May 11 18:03:12 2021 +0800

    gtk/gtkmm/*.h: Export class selectively as needed
    
    We want to avoid exporting classes that contain a std::vector<...> or
    std::unique_pointer<...> member, so don't export these class as a whole but
    export its methods individually.
    
    Also, remove an extraneous GTKMM_API in listviewtext.h.
    
    This will eliminate warnings C4251 and C4275 and avoid having the built code
    depend on a specific STL and compiler version

 gtk/gtkmm/bitsetconstiter.h | 28 ++++++++++++++--------------
 gtk/gtkmm/listviewtext.h    |  2 +-
 gtk/gtkmm/treemodelcolumn.h | 16 ++++++++--------
 3 files changed, 23 insertions(+), 23 deletions(-)
---
diff --git a/gtk/gtkmm/bitsetconstiter.h b/gtk/gtkmm/bitsetconstiter.h
index e15e49b0..abd10400 100644
--- a/gtk/gtkmm/bitsetconstiter.h
+++ b/gtk/gtkmm/bitsetconstiter.h
@@ -36,7 +36,7 @@ namespace Gtk
  *
  * @newin{3,98}
  */
-class GTKMM_API BitsetConstIter
+class BitsetConstIter
 {
 public:
   using iterator_category = std::bidirectional_iterator_tag;
@@ -46,20 +46,20 @@ public:
   using pointer           = void;
 
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
-  BitsetConstIter() {}
-  BitsetConstIter(const GtkBitset* bitset, bool is_end);
+  GTKMM_API BitsetConstIter() {}
+  GTKMM_API BitsetConstIter(const GtkBitset* bitset, bool is_end);
 #endif // DOXYGEN_SHOULD_SKIP_THIS
 
-  BitsetConstIter(const BitsetConstIter& other);
-  BitsetConstIter& operator=(const BitsetConstIter& other);
-  BitsetConstIter(BitsetConstIter&& other) noexcept;
-  BitsetConstIter& operator=(BitsetConstIter&& other) noexcept;
+  GTKMM_API BitsetConstIter(const BitsetConstIter& other);
+  GTKMM_API BitsetConstIter& operator=(const BitsetConstIter& other);
+  GTKMM_API BitsetConstIter(BitsetConstIter&& other) noexcept;
+  GTKMM_API BitsetConstIter& operator=(BitsetConstIter&& other) noexcept;
 
-  BitsetConstIter& operator++();
-  BitsetConstIter  operator++(int);
-  BitsetConstIter& operator--();
-  BitsetConstIter  operator--(int);
-  reference operator*() const;
+  GTKMM_API BitsetConstIter& operator++();
+  GTKMM_API BitsetConstIter  operator++(int);
+  GTKMM_API BitsetConstIter& operator--();
+  GTKMM_API BitsetConstIter  operator--(int);
+  GTKMM_API reference operator*() const;
 
   /** Discovers whether the iterator is valid, and not equal to end().
    * For instance,
@@ -68,9 +68,9 @@ public:
    *   do_something();
    * @endcode
    */
-  explicit operator bool() const noexcept;
+  GTKMM_API explicit operator bool() const noexcept;
 
-  bool equal(const BitsetConstIter& other) const noexcept;
+  GTKMM_API bool equal(const BitsetConstIter& other) const noexcept;
 
 private:
   std::unique_ptr<GtkBitsetIter> gobject_;
diff --git a/gtk/gtkmm/listviewtext.h b/gtk/gtkmm/listviewtext.h
index 172811d7..6f05ac7c 100644
--- a/gtk/gtkmm/listviewtext.h
+++ b/gtk/gtkmm/listviewtext.h
@@ -112,7 +112,7 @@ public:
 
 protected:
 
- class GTKMM_API TextModelColumns : public Gtk::TreeModel::ColumnRecord
+ class TextModelColumns : public Gtk::TreeModel::ColumnRecord
   {
   public:
     TextModelColumns(guint columns_count);
diff --git a/gtk/gtkmm/treemodelcolumn.h b/gtk/gtkmm/treemodelcolumn.h
index 956aa0af..78d8c409 100644
--- a/gtk/gtkmm/treemodelcolumn.h
+++ b/gtk/gtkmm/treemodelcolumn.h
@@ -67,28 +67,28 @@ class GTKMM_API TreeModelColumnBase;
  * sure it's instantiated after Gtk::Main), even when creating multiple models
  * from it.
  */
-class GTKMM_API TreeModelColumnRecord
+class TreeModelColumnRecord
 {
 public:
-  TreeModelColumnRecord();
-  virtual ~TreeModelColumnRecord() noexcept;
+  GTKMM_API TreeModelColumnRecord();
+  GTKMM_API virtual ~TreeModelColumnRecord() noexcept;
 
   /** Adds a TreeModelColumn to this record.
    * add() not only registers the @a column, but also assigns a column
    * index to it.  Once registered, the TreeModelColumn is final, and
    * you're free to pass it around by value.
    */
-  void add(TreeModelColumnBase& column);
+  GTKMM_API void add(TreeModelColumnBase& column);
 
-  unsigned int size()  const;
-  const GType* types() const;
+  GTKMM_API unsigned int size()  const;
+  GTKMM_API const GType* types() const;
 
 private:
   std::vector<GType> column_types_;
 
   // noncopyable
-  TreeModelColumnRecord(const TreeModelColumnRecord&);
-  TreeModelColumnRecord& operator=(const TreeModelColumnRecord&);
+  GTKMM_API TreeModelColumnRecord(const TreeModelColumnRecord&);
+  GTKMM_API TreeModelColumnRecord& operator=(const TreeModelColumnRecord&);
 };