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# Ceres Solver - A fast non-linear least squares minimizer
# Copyright 2014 Google Inc. All rights reserved.
# http://code.google.com/p/ceres-solver/
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * Neither the name of Google Inc. nor the names of its contributors may be
# used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# Author: sergey.vfx@gmail.com (Sergey Sharybin)
#
# FindSharedPtr.cmake - Find shared pointer header and namespace.
#
# This module defines the following variables:
#
# SHARED_PTR_FOUND: TRUE if shared_ptr found.
# SHARED_PTR_TR1_MEMORY_HEADER: True if <tr1/memory> header is to be used
# for the shared_ptr object, otherwise use <memory>.
# SHARED_PTR_TR1_NAMESPACE: TRUE if shared_ptr is defined in std::tr1 namespace,
# otherwise it's assumed to be defined in std namespace.
MACRO(FIND_SHARED_PTR)
SET(SHARED_PTR_FOUND FALSE)
CHECK_INCLUDE_FILE_CXX(memory HAVE_STD_MEMORY_HEADER)
IF (HAVE_STD_MEMORY_HEADER)
# Finding the memory header doesn't mean that shared_ptr is in std
# namespace.
#
# In particular, MSVC 2008 has shared_ptr declared in std::tr1. In
# order to support this, we do an extra check to see which namespace
# should be used.
INCLUDE(CheckCXXSourceCompiles)
CHECK_CXX_SOURCE_COMPILES("#include <memory>
int main() {
std::shared_ptr<int> int_ptr;
return 0;
}"
HAVE_SHARED_PTR_IN_STD_NAMESPACE)
IF (HAVE_SHARED_PTR_IN_STD_NAMESPACE)
MESSAGE("-- Found shared_ptr in std namespace using <memory> header.")
SET(SHARED_PTR_FOUND TRUE)
ELSE (HAVE_SHARED_PTR_IN_STD_NAMESPACE)
CHECK_CXX_SOURCE_COMPILES("#include <memory>
int main() {
std::tr1::shared_ptr<int> int_ptr;
return 0;
}"
HAVE_SHARED_PTR_IN_TR1_NAMESPACE)
IF (HAVE_SHARED_PTR_IN_TR1_NAMESPACE)
MESSAGE("-- Found shared_ptr in std::tr1 namespace using <memory> header.")
SET(SHARED_PTR_TR1_NAMESPACE TRUE)
SET(SHARED_PTR_FOUND TRUE)
ENDIF (HAVE_SHARED_PTR_IN_TR1_NAMESPACE)
ENDIF (HAVE_SHARED_PTR_IN_STD_NAMESPACE)
ENDIF (HAVE_STD_MEMORY_HEADER)
IF (NOT SHARED_PTR_FOUND)
# Further, gcc defines shared_ptr in std::tr1 namespace and
# <tr1/memory> is to be included for this. And what makes things
# even more tricky is that gcc does have <memory> header, so
# all the checks above wouldn't find shared_ptr.
CHECK_INCLUDE_FILE_CXX("tr1/memory" HAVE_TR1_MEMORY_HEADER)
IF (HAVE_TR1_MEMORY_HEADER)
CHECK_CXX_SOURCE_COMPILES("#include <tr1/memory>
int main() {
std::tr1::shared_ptr<int> int_ptr;
return 0;
}"
HAVE_SHARED_PTR_IN_TR1_NAMESPACE_FROM_TR1_MEMORY_HEADER)
IF (HAVE_SHARED_PTR_IN_TR1_NAMESPACE_FROM_TR1_MEMORY_HEADER)
MESSAGE("-- Found shared_ptr in std::tr1 namespace using <tr1/memory> header.")
SET(SHARED_PTR_TR1_MEMORY_HEADER TRUE)
SET(SHARED_PTR_TR1_NAMESPACE TRUE)
SET(SHARED_PTR_FOUND TRUE)
ENDIF (HAVE_SHARED_PTR_IN_TR1_NAMESPACE_FROM_TR1_MEMORY_HEADER)
ENDIF (HAVE_TR1_MEMORY_HEADER)
ENDIF (NOT SHARED_PTR_FOUND)
ENDMACRO(FIND_SHARED_PTR)
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