Added

• Forward headers providing non-defining declarations of bsoncxx and mongocxx class types.
  • Note: user-defined forward declarations of any library entity has not been, and is still not, supported. To obtain the declaration or definition of a library entity, always include the corresponding header.
• The CMake option ENABLE_BSONCXX_USE_POLY_IMPLS (OFF by default) allows selecting bsoncxx implementations of C++17 polyfills by default when no polyfill library is requested.
• The CMake option BSONCXX_POLY_USE_IMPLS (OFF by default) allows selecting bsoncxx implementations of C++17 polyfills instead of external libraries or the C++ standard library.

Changed

• The bsoncxx::v_noabi and mongocxx::v_noabi namespaces are no longer declared inline.
  • This change is not expected to break source or binary compatibility, but is nevertheless documented here due to its significance. If this change does inadvertently break source or binary compatibility, please submit a bug report.
  • Root namespace declarations are still supported and expected to remain equivalent to their prior definitions (e.g. bsoncxx::document is still equivalent to bsoncxx::v_noabi::document, mongocxx::client is still equivalent to mongocxx::v_noabi::client, etc.). Argument-dependent lookup and template instantiations are expected to remain equivalent to their prior behavior.
  • Note: user-defined forward declarations of any library entity has not been, and is still not, supported. To obtain the declaration or definition of a library entity, always include the corresponding header.
• Library filenames, when compiled with MSVC (as detected by CMake's MSVC variable), are now embedded with an ABI tag string, e.g. bsoncxx-v_noabi-rhs-x64-v142-md.lib.
  • This new behavior is enabled by default; disable by setting ENABLE_ABI_TAG_IN_LIBRARY_FILENAMES=OFF when configuring the CXX Driver.
  • The ABI tag string can also be embedded in pkg-config metadata filenames, e.g. libbsoncxx-v_noabi-rhs-x64-v142-md.pc. This is disabled by default; enable by setting ENABLE_ABI_TAG_IN_PKGCONFIG_FILENAMES=ON (requires ENABLE_ABI_TAG_IN_LIBRARY_FILENAMES=ON).

Removed

• Deprecated CMake package config files.
  • find_package(libbsoncxx) and find_package(libmongocxx) are no longer supported. Use find_package(bsoncxx) and find_package(mongocxx) instead.
  • Accordingly, LIBBSONCXX_* and LIBMONGOCXX_* CMake variables provided by the legacy CMake package config files are no longer supported. Use the mongo::bsoncxx_* and mongo::mongocxx_* CMake targets instead.
  • Note: manually setting compile definitions, include directories, and link libraries is unnecessary with target-based CMake. The former LIBBSONCXX_* and LIBMONGOCXX_* CMake variables are superseded by the target_link_libraries() CMake command, which automatically propagates the necessary compile definitions, include directories, and link libraries to dependent targets via mongo::bsoncxx_* and mongo::mongocxx_* interface properties.
• Experimental C++ standard library as a polyfill option via BSONCXX_POLY_USE_STD_EXPERIMENTAL.

See the full list of changes in Jira.

Feedback

To report a bug or request a feature, please open a ticket in the MongoDB issue management tool Jira:

• Create an account and login.
• Navigate to the CXX project
• Click Create.