Merge branch 'clean-up-pre-c++98-compatibility-macro' of https://github.com/minoki/wxWidgets

Don't bother with checking for some really obsolete compilers and just assume
that C++98 keywords "explicit", "{static,const,dynamic}_cast" and support for
partial template specialization is always available.

Closes #17655.

interface/wx/defs.h

@@ -1699,17 +1699,6 @@ template <typename T> wxDELETEA(T*& array);
 */
 #define wxDEPRECATED_BUT_USED_INTERNALLY_INLINE(func, body)
 
-/**
-    @c wxEXPLICIT is a macro which expands to the C++ @c explicit keyword if
-    the compiler supports it or nothing otherwise. Thus, it can be used even in
-    the code which might have to be compiled with an old compiler without
-    support for this language feature but still take advantage of it when it is
-    available.
-
-    @header{wx/defs.h}
-*/
-#define wxEXPLICIT
-
 /**
     @c wxOVERRIDE expands to the C++11 @c override keyword if it's supported by
     the compiler or nothing otherwise.

interface/wx/object.h

@@ -789,39 +789,6 @@ public:
 */
 #define wxIMPLEMENT_CLASS2( className, baseClassName1, baseClassName2 )
 
-/**
-    Same as @c const_cast<T>(x) if the compiler supports const cast or @c (T)x for
-    old compilers. Unlike wxConstCast(), the cast it to the type @c T and not to
-    <tt>T *</tt> and also the order of arguments is the same as for the standard cast.
-
-    @header{wx/defs.h}
-
-    @see wx_reinterpret_cast(), wx_static_cast()
-*/
-#define wx_const_cast(T, x)
-
-/**
-    Same as @c reinterpret_cast<T>(x) if the compiler supports reinterpret cast or
-    @c (T)x for old compilers.
-
-    @header{wx/defs.h}
-
-    @see wx_const_cast(), wx_static_cast()
-*/
-#define wx_reinterpret_cast(T, x)
-
-/**
-    Same as @c static_cast<T>(x) if the compiler supports static cast or @c (T)x for
-    old compilers. Unlike wxStaticCast(), there are no checks being done and
-    the meaning of the macro arguments is exactly the same as for the standard
-    static cast, i.e. @a T is the full type name and star is not appended to it.
-
-    @header{wx/defs.h}
-
-    @see wx_const_cast(), wx_reinterpret_cast(), wx_truncate_cast()
-*/
-#define wx_static_cast(T, x)
-
 /**
     This case doesn’t correspond to any standard cast but exists solely to make
     casts which possibly result in a truncation of an integer value more
@@ -837,7 +804,7 @@ public:
 
     @header{wx/defs.h}
 
-    @see wx_const_cast(), wxDynamicCast(), wxStaticCast()
+    @see wxDynamicCast(), wxStaticCast()
 */
 #define wxConstCast( ptr, classname )
 
@@ -889,7 +856,7 @@ public:
 
     @header{wx/object.h}
 
-    @see wx_static_cast(), wxDynamicCast(), wxConstCast()
+    @see wxDynamicCast(), wxConstCast()
 */
 #define wxStaticCast( ptr, classname )
 

interface/wx/pickerbase.h

@@ -89,7 +89,7 @@ public:
                 // wxMSW is one of the platforms where the generic implementation
                 // of wxFilePickerCtrl is used...
 
-                wxButton *pButt = wx_static_cast(wxButton*, myFilePickerCtrl->GetPickerCtrl());
+                wxButton *pButt = static_cast<wxButton*>(myFilePickerCtrl->GetPickerCtrl());
                 if (pButt)
                     pButt->SetLabel("Custom browse string");
             #endif

interface/wx/sharedptr.h

@@ -26,7 +26,7 @@ public:
         Creates shared pointer from the raw pointer @a ptr and takes ownership
         of it.
     */
-    wxEXPLICIT wxSharedPtr(T* ptr = NULL);
+    explicit wxSharedPtr(T* ptr = NULL);
 
     /**
         Constructor.
@@ -42,7 +42,7 @@ public:
         @since 3.0
     */
     template<typename Deleter>
-    wxEXPLICIT wxSharedPtr(T* ptr, Deleter d);
+    explicit wxSharedPtr(T* ptr, Deleter d);
 
     /**
         Copy constructor.