1# Ceres Solver - A fast non-linear least squares minimizer
2# Copyright 2014 Google Inc. All rights reserved.
3# http://code.google.com/p/ceres-solver/
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions are met:
7#
8# * Redistributions of source code must retain the above copyright notice,
9#   this list of conditions and the following disclaimer.
10# * Redistributions in binary form must reproduce the above copyright notice,
11#   this list of conditions and the following disclaimer in the documentation
12#   and/or other materials provided with the distribution.
13# * Neither the name of Google Inc. nor the names of its contributors may be
14#   used to endorse or promote products derived from this software without
15#   specific prior written permission.
16#
17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27# POSSIBILITY OF SUCH DAMAGE.
28#
29# Author: sergey.vfx@gmail.com (Sergey Sharybin)
30#
31
32# FindSharedPtr.cmake - Find shared pointer header and namespace.
33#
34# This module defines the following variables:
35#
36# SHARED_PTR_FOUND: TRUE if shared_ptr found.
37# SHARED_PTR_TR1_MEMORY_HEADER: True if <tr1/memory> header is to be used
38# for the shared_ptr object, otherwise use <memory>.
39# SHARED_PTR_TR1_NAMESPACE: TRUE if shared_ptr is defined in std::tr1 namespace,
40# otherwise it's assumed to be defined in std namespace.
41
42MACRO(FIND_SHARED_PTR)
43  SET(SHARED_PTR_FOUND FALSE)
44  CHECK_INCLUDE_FILE_CXX(memory HAVE_STD_MEMORY_HEADER)
45  IF (HAVE_STD_MEMORY_HEADER)
46    # Finding the memory header doesn't mean that shared_ptr is in std
47    # namespace.
48    #
49    # In particular, MSVC 2008 has shared_ptr declared in std::tr1.  In
50    # order to support this, we do an extra check to see which namespace
51    # should be used.
52    INCLUDE(CheckCXXSourceCompiles)
53    CHECK_CXX_SOURCE_COMPILES("#include <memory>
54                               int main() {
55                                 std::shared_ptr<int> int_ptr;
56                                 return 0;
57                               }"
58                              HAVE_SHARED_PTR_IN_STD_NAMESPACE)
59
60    IF (HAVE_SHARED_PTR_IN_STD_NAMESPACE)
61      MESSAGE("-- Found shared_ptr in std namespace using <memory> header.")
62      SET(SHARED_PTR_FOUND TRUE)
63    ELSE (HAVE_SHARED_PTR_IN_STD_NAMESPACE)
64      CHECK_CXX_SOURCE_COMPILES("#include <memory>
65                                 int main() {
66                                   std::tr1::shared_ptr<int> int_ptr;
67                                   return 0;
68                                 }"
69                                HAVE_SHARED_PTR_IN_TR1_NAMESPACE)
70      IF (HAVE_SHARED_PTR_IN_TR1_NAMESPACE)
71        MESSAGE("-- Found shared_ptr in std::tr1 namespace using <memory> header.")
72        SET(SHARED_PTR_TR1_NAMESPACE TRUE)
73        SET(SHARED_PTR_FOUND TRUE)
74      ENDIF (HAVE_SHARED_PTR_IN_TR1_NAMESPACE)
75    ENDIF (HAVE_SHARED_PTR_IN_STD_NAMESPACE)
76  ENDIF (HAVE_STD_MEMORY_HEADER)
77
78  IF (NOT SHARED_PTR_FOUND)
79    # Further, gcc defines shared_ptr in std::tr1 namespace and
80    # <tr1/memory> is to be included for this. And what makes things
81    # even more tricky is that gcc does have <memory> header, so
82    # all the checks above wouldn't find shared_ptr.
83    CHECK_INCLUDE_FILE_CXX("tr1/memory" HAVE_TR1_MEMORY_HEADER)
84    IF (HAVE_TR1_MEMORY_HEADER)
85      CHECK_CXX_SOURCE_COMPILES("#include <tr1/memory>
86                                 int main() {
87                                   std::tr1::shared_ptr<int> int_ptr;
88                                   return 0;
89                                 }"
90                                HAVE_SHARED_PTR_IN_TR1_NAMESPACE_FROM_TR1_MEMORY_HEADER)
91      IF (HAVE_SHARED_PTR_IN_TR1_NAMESPACE_FROM_TR1_MEMORY_HEADER)
92        MESSAGE("-- Found shared_ptr in std::tr1 namespace using <tr1/memory> header.")
93          SET(SHARED_PTR_TR1_MEMORY_HEADER TRUE)
94          SET(SHARED_PTR_TR1_NAMESPACE TRUE)
95        SET(SHARED_PTR_FOUND TRUE)
96      ENDIF (HAVE_SHARED_PTR_IN_TR1_NAMESPACE_FROM_TR1_MEMORY_HEADER)
97    ENDIF (HAVE_TR1_MEMORY_HEADER)
98  ENDIF (NOT SHARED_PTR_FOUND)
99ENDMACRO(FIND_SHARED_PTR)
100