62 lines
2.3 KiB
C++
62 lines
2.3 KiB
C++
/*
|
|
* Copyright © 2007,2008,2009,2010 Red Hat, Inc.
|
|
* Copyright © 2012,2018 Google, Inc.
|
|
*
|
|
* This is part of HarfBuzz, a text shaping library.
|
|
*
|
|
* Permission is hereby granted, without written agreement and without
|
|
* license or royalty fees, to use, copy, modify, and distribute this
|
|
* software and its documentation for any purpose, provided that the
|
|
* above copyright notice and the following two paragraphs appear in
|
|
* all copies of this software.
|
|
*
|
|
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
|
|
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
|
|
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
|
|
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
|
|
* DAMAGE.
|
|
*
|
|
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
|
|
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
|
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
|
|
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
|
|
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
*
|
|
* Red Hat Author(s): Behdad Esfahbod
|
|
* Google Author(s): Behdad Esfahbod
|
|
*/
|
|
|
|
#ifndef HB_DISPATCH_HH
|
|
#define HB_DISPATCH_HH
|
|
|
|
#include "hb.hh"
|
|
|
|
/*
|
|
* Dispatch
|
|
*/
|
|
|
|
template <typename Context, typename Return=hb_empty_t, unsigned int MaxDebugDepth=0>
|
|
struct hb_dispatch_context_t
|
|
{
|
|
hb_dispatch_context_t () : debug_depth (0) {}
|
|
private:
|
|
/* https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern */
|
|
const Context* thiz () const { return static_cast<const Context *> (this); }
|
|
Context* thiz () { return static_cast< Context *> (this); }
|
|
public:
|
|
const char *get_name () { return "UNKNOWN"; }
|
|
static constexpr unsigned max_debug_depth = MaxDebugDepth;
|
|
typedef Return return_t;
|
|
template <typename T, typename F>
|
|
bool may_dispatch (const T *obj HB_UNUSED, const F *format HB_UNUSED) { return true; }
|
|
template <typename T, typename ...Ts>
|
|
return_t dispatch (const T &obj, Ts&&... ds)
|
|
{ return obj.dispatch (thiz (), hb_forward<Ts> (ds)...); }
|
|
static return_t no_dispatch_return_value () { return Context::default_return_value (); }
|
|
static bool stop_sublookup_iteration (const return_t r HB_UNUSED) { return false; }
|
|
unsigned debug_depth;
|
|
};
|
|
|
|
|
|
#endif /* HB_DISPATCH_HH */
|