ams-tschoening commented on a change in pull request #53:
URL: https://github.com/apache/logging-log4cxx/pull/53#discussion_r583550738
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File path: src/cmake/boost-fallback/boost-std-configuration.h.cmake
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@@ -0,0 +1,94 @@
+#ifndef BOOST_STD_CONFIGURATION_H
+#define BOOST_STD_CONFIGURATION_H
+
+#cmakedefine01 STD_THREAD_FOUND
+#cmakedefine01 Boost_THREAD_FOUND
+#cmakedefine01 STD_MUTEX_FOUND
+#cmakedefine01 Boost_MUTEX_FOUND
+#cmakedefine01 STD_SHARED_MUTEX_FOUND
+#cmakedefine01 Boost_SHARED_MUTEX_FOUND
+#cmakedefine01 STD_SHARED_PTR_FOUND
+#cmakedefine01 Boost_SHARED_PTR_FOUND
+#cmakedefine01 STD_ATOMIC_FOUND
+#cmakedefine01 Boost_ATOMIC_FOUND
+
+#if STD_THREAD_FOUND
+#include <thread>
+namespace ${NAMESPACE_ALIAS} {
+ typedef std::thread thread;
+}
+#elif Boost_THREAD_FOUND
+#include <boost/thread.hpp>
+namespace ${NAMESPACE_ALIAS} {
+ typedef boost::thread thread;
+}
+#endif
+
+#if STD_MUTEX_FOUND
+#include <mutex>
+#include <condition_variable>
+namespace ${NAMESPACE_ALIAS} {
+ typedef std::mutex mutex;
+ template <typename T>
+ using unique_lock = std::unique_lock<T>;
+ typedef std::condition_variable condition_variable;
+}
+#elif Boost_MUTEX_FOUND
+#include <boost/thread.hpp>
+namespace ${NAMESPACE_ALIAS} {
+ typedef boost::mutex mutex;
+ template <typename T>
+ using unique_lock = boost::unique_lock<T>;
+ typedef boost::condition_variable condition_variable;
+}
+#endif
+
+#if STD_SHARED_MUTEX_FOUND
+#include <shared_mutex>
+namespace ${NAMESPACE_ALIAS} {
+ typedef std::shared_mutex shared_mutex;
+ template <typename T>
+ using shared_lock = std::shared_lock<T>;
+}
+#elif Boost_SHARED_MUTEX_FOUND
+#include <boost/thread/shared_mutex.hpp>
+namespace ${NAMESPACE_ALIAS} {
+ typedef boost::shared_mutex shared_mutex;
+ template <typename T>
+ using shared_lock = boost::shared_lock<T>;
+}
+#endif
+
+#if STD_SHARED_PTR_FOUND
+#include <memory>
+namespace ${NAMESPACE_ALIAS} {
+ template <typename T>
+ using shared_ptr = std::shared_ptr<T>;
+ template <typename T>
+ using weak_ptr = std::weak_ptr<T>;
+}
+#elif Boost_SHARED_PTR_FOUND
+#include <boost/smart_ptr.hpp>
+namespace ${NAMESPACE_ALIAS} {
+ template <typename T>
+ using shared_ptr = boost::shared_ptr<T>;
+ template <typename T>
+ using weak_ptr = boost::weak_ptr<T>;
+}
+#endif
+
+#if STD_ATOMIC_FOUND
+#include <atomic>
+namespace ${NAMESPACE_ALIAS} {
+ template <typename T>
+ using atomic = std::atomic<T>;
+}
+#elif Boost_ATOMIC_FOUND
+#include <boost/atomic.hpp>
Review comment:
Another example for problems with too old compilers: My C++-Builder 10.2
UPD 3 with 32 Bit BCC provides boost 1.39 in theory, which seems to use a
[different namespace for
atomic](https://www.boost.org/doc/libs/1_39_0/boost/interprocess/detail/atomic.hpp).
Additionally, exactly those parts of boost seem to not be available for my
compiler at all, I simply can't find associated files. :-) when searching for
`atomic.hpp`, I onl y get results named like `atomic_count_*.hpp` from
`boost\smart_ptr\detail`.
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