restored find atomic

CMakeLists.txt

@@ -32,6 +32,7 @@ project(
 
 list(PREPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
+include(FindAtomic)
 include(CheckFunctionExists)
 include(CheckIncludeFiles)
 include(CheckLibraryExists)
@@ -366,7 +367,7 @@ target_include_directories(
 	"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
 	PRIVATE "${BOOST_REGEX_INCLUDE_DIR}" "${EIGEN_INCLUDE_DIR}")
 
-target_link_libraries(cifpp PUBLIC Threads::Threads ZLIB::ZLIB)
+target_link_libraries(cifpp PUBLIC Threads::Threads ZLIB::ZLIB std::atomic)
 
 if(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
 	target_link_options(cifpp PRIVATE -undefined dynamic_lookup)

include/cif++/condition.hpp

@@ -1292,9 +1292,9 @@ template <typename T>
 condition operator!=(const key &key, const std::optional<T> &v)
 {
 	if (v.has_value())
-		return condition(new detail::not_condition_impl(condition{new detail::key_equals_condition_impl({ key.m_item_name, *v })}));
+		return condition(new detail::not_condition_impl(condition(new detail::key_equals_condition_impl({ key.m_item_name, *v }))));
 	else
-		return condition(new detail::not_condition_impl(condition{new detail::key_is_empty_condition_impl(key.m_item_name)}));
+		return condition(new detail::not_condition_impl(condition(new detail::key_is_empty_condition_impl(key.m_item_name))));
 }
 
 /**