Base class for Gtk::Expression.  
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#include <gtkmm/expression.h>
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| using | SlotNotify = sigc::slot<void()> | 
|  | For instance: void on_notify();. 
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| void | reference () const | 
|  | Increment the reference count for this object. 
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| void | unreference () const | 
|  | Decrement the reference count for this object. 
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| GtkExpression * | gobj () | 
|  | Provides access to the underlying C instance. 
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| const GtkExpression * | gobj () const | 
|  | Provides access to the underlying C instance. 
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| GtkExpression * | gobj_copy () const | 
|  | Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. 
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|  | ExpressionBase ()=delete | 
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|  | ExpressionBase (const ExpressionBase &)=delete | 
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| ExpressionBase & | operator= (const ExpressionBase &)=delete | 
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| GType | get_value_type () const | 
|  | Gets the GTypethat this expression evaluates to.
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| bool | is_static () const | 
|  | Checks if the expression is static. 
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◆ SlotNotify
◆ ExpressionBase() [1/2]
  
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          | Gtk::ExpressionBase::ExpressionBase | ( |  | ) |  |  | delete | 
 
 
◆ ExpressionBase() [2/2]
◆ get_value_type()
      
        
          | GType Gtk::ExpressionBase::get_value_type | ( |  | ) | const | 
      
 
Gets the GType that this expression evaluates to. 
This type is constant and will not change over the lifetime of this expression.
- Returns
- The type returned from Gtk::Expression::evaluate(). 
 
 
◆ gobj() [1/2]
      
        
          | GtkExpression * Gtk::ExpressionBase::gobj | ( |  | ) |  | 
      
 
Provides access to the underlying C instance. 
 
 
◆ gobj() [2/2]
      
        
          | const GtkExpression * Gtk::ExpressionBase::gobj | ( |  | ) | const | 
      
 
Provides access to the underlying C instance. 
 
 
◆ gobj_copy()
      
        
          | GtkExpression * Gtk::ExpressionBase::gobj_copy | ( |  | ) | const | 
      
 
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. 
 
 
◆ is_static()
      
        
          | bool Gtk::ExpressionBase::is_static | ( |  | ) | const | 
      
 
Checks if the expression is static. 
A static expression will never change its result when Gtk::Expression::evaluate() is called on it with the same arguments.
That means a call to Gtk::Expression::watch() is not necessary because it will never trigger a notify.
- Returns
- trueif the expression is static.
 
 
◆ operator delete()
  
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          | void Gtk::ExpressionBase::operator delete | ( | void * | , |  
          |  |  | std::size_t | ) |  | protected | 
 
 
◆ operator=()
◆ reference()
      
        
          | void Gtk::ExpressionBase::reference | ( |  | ) | const | 
      
 
Increment the reference count for this object. 
You should never need to do this manually - use the object via a RefPtr instead. 
 
 
◆ unreference()
      
        
          | void Gtk::ExpressionBase::unreference | ( |  | ) | const | 
      
 
Decrement the reference count for this object. 
You should never need to do this manually - use the object via a RefPtr instead. 
 
 
◆ wrap()
A Glib::wrap() method for this object. 
- Parameters
- 
  
    | object | The C instance. |  | take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref. |  
 
- Returns
- A C++ instance that wraps this C instance.