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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libstdc++-v3/testsuite/ext/pb_ds/example/hash_find_neg.cc | |
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Diffstat (limited to 'libstdc++-v3/testsuite/ext/pb_ds/example/hash_find_neg.cc')
-rw-r--r-- | libstdc++-v3/testsuite/ext/pb_ds/example/hash_find_neg.cc | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/ext/pb_ds/example/hash_find_neg.cc b/libstdc++-v3/testsuite/ext/pb_ds/example/hash_find_neg.cc new file mode 100644 index 000000000..e2781a03e --- /dev/null +++ b/libstdc++-v3/testsuite/ext/pb_ds/example/hash_find_neg.cc @@ -0,0 +1,69 @@ +// { dg-do compile } +// -*- C++ -*- + +// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library 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. + +// This library 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 this library; see the file COPYING3. If not see +// <http://www.gnu.org/licenses/>. + + +// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. + +// Permission to use, copy, modify, sell, and distribute this software +// is hereby granted without fee, provided that the above copyright +// notice appears in all copies, and that both that copyright notice +// and this permission notice appear in supporting documentation. None +// of the above authors, nor IBM Haifa Research Laboratories, make any +// representation about the suitability of this software for any +// purpose. It is provided "as is" without express or implied +// warranty. + +/** + * @file hash_bad_find_example.cpp + * An example showing how *not* to use unordered containers. + */ + +/** + * This non-compiling example shows wrong use of unordered + * associative-containers. These types of containers have distinct + * point-type and range-type iterator types. + **/ + +#include <utility> +#include <ext/pb_ds/assoc_container.hpp> + +using namespace std; +using namespace __gnu_pbds; + +int main() +{ + // A collision-chaining hash table mapping ints to chars. + typedef cc_hash_table<int, char> map_t; + + // A map_t object. + map_t h; + + // Insert a value mapping the int 1 to the char 'a'. + h.insert(make_pair(1, 'a')); + + // Find the entry of the key '1' the* wrong* way. + // The following line will not compile, since map_t::find returns a + // point-iterator, which, by design, is not convertible to a + // range-iterator. + map_t::iterator it = h.find(1); // { dg-error "conversion from" } + + return 0; +} + |