Fix compilation error when targeting C++23 #926
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Compilation fails if cxx_std_17 is changed to cxx_std_23 because expected_lite namespace is not defined. Commit fixes this.
/home/vincent/BehaviorTree.CPP/include/behaviortree_cpp/json_export.h:117: error: ‘nonstd::expected_lite’ has not been declared; did you mean ‘nonstd::unexpected_type’? [-Wtemplate-body]
In file included from /home/vincent/BehaviorTree.CPP/src/blackboard.cpp:3:
/home/vincent/BehaviorTree.CPP/include/behaviortree_cpp/json_export.h: In member function ‘BT::Expected<T> BT::JsonExporter::fromJson(const nlohmann::json_abi_v3_11_3::json&) const’:
/home/vincent/BehaviorTree.CPP/include/behaviortree_cpp/json_export.h:117:20: error: ‘nonstd::expected_lite’ has not been declared; did you mean ‘nonstd::unexpected_type’? [-Wtemplate-body]
117 | return nonstd::expected_lite::make_unexpected(res.error());
| ^~~~~~~~~~~~~
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Compilation fails if cxx_std_17 is changed to cxx_std_23 with gcc 15 because expected_lite namespace is not declared. Commit fixes this.
/home/vincent/BehaviorTree.CPP/include/behaviortree_cpp/json_export.h:117: error: ‘nonstd::expected_lite’ has not been declared; did you mean ‘nonstd::unexpected_type’? [-Wtemplate-body] In file included from /home/vincent/BehaviorTree.CPP/src/blackboard.cpp:3: /home/vincent/BehaviorTree.CPP/include/behaviortree_cpp/json_export.h: In member function ‘BT::Expected BT::JsonExporter::fromJson(const nlohmann::json_abi_v3_11_3::json&) const’: /home/vincent/BehaviorTree.CPP/include/behaviortree_cpp/json_export.h:117:20: error: ‘nonstd::expected_lite’ has not been declared; did you mean ‘nonstd::unexpected_type’? [-Wtemplate-body]
117 | return nonstd::expected_lite::make_unexpected(res.error());
| ^~~~~~~~~~~~~