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/* Utilities for querying and manipulating type trees.
Copyright (C) 2013-2014 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_CP_TYPE_UTILS_H
#define GCC_CP_TYPE_UTILS_H
/* Returns the first tree within T that is directly matched by PRED. T may be a
type or PARM_DECL and is incrementally decomposed toward its type-specifier
until a match is found. NULL_TREE is returned if PRED does not match any
part of T.
This is primarily intended for detecting whether T uses `auto' or a concept
identifier. Since either of these can only appear as a type-specifier for
the declaration in question, only top-level qualifications are traversed;
find_type_usage does not look through the whole type. */
inline tree
find_type_usage (tree t, bool (*pred) (const_tree))
{
enum tree_code code;
if (pred (t))
return t;
code = TREE_CODE (t);
if (code == POINTER_TYPE || code == REFERENCE_TYPE
|| code == PARM_DECL || code == OFFSET_TYPE
|| code == FUNCTION_TYPE || code == METHOD_TYPE
|| code == ARRAY_TYPE)
return find_type_usage (TREE_TYPE (t), pred);
if (TYPE_PTRMEMFUNC_P (t))
return find_type_usage
(TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (t)), pred);
return NULL_TREE;
}
#endif // GCC_CP_TYPE_UTILS_H
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