lsst.afw g7304ef7ade+7dcd958d67
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type_traits.h
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1// -*- LSST-C++ -*-
2/*
3 * This file is part of afw.
4 *
5 * Developed for the LSST Data Management System.
6 * This product includes software developed by the LSST Project
7 * (https://www.lsst.org).
8 * See the COPYRIGHT file at the top-level directory of this distribution
9 * for details of code ownership.
10 *
11 * This program is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program. If not, see <https://www.gnu.org/licenses/>.
23 */
24
25#ifndef LSST_AFW_TYPEHANDLING_DETAIL_TYPETRAITS_H
26#define LSST_AFW_TYPEHANDLING_DETAIL_TYPETRAITS_H
27
28#include <type_traits>
29
30namespace lsst {
31namespace afw {
32namespace typehandling {
33namespace detail {
34
35// Test for smart pointers as "any type with an element_type member"
36// Second template parameter is a dummy to let us do some metaprogramming
37template <typename, typename = void>
38constexpr bool IS_SMART_PTR = false;
39template <typename T>
40constexpr bool IS_SMART_PTR<T, std::enable_if_t<std::is_object<typename T::element_type>::value>> = true;
41
42} // namespace detail
43} // namespace typehandling
44} // namespace afw
45} // namespace lsst
46
47#endif