• New library: opt_ref_buffer
• any: fix compilation error on latest libstdc++ (scoping nullptr_t)
• mem_streambuf: improve get_container perf when using containers with small value optimizations
• flat_map, flat_set: fix const_pointer typedef (wasn't actually const)
• generator: stronger noexcept guarantees
• Minor test and ci tweaks

expected:

• fix move assignment in <void, E> specialization
• add emplace to all specializations

• flat_map, flat_set:
  • hint-based insertion
  • ready_tag constructors for pre-sorted containers/initializer lists
• generator: allow return values
• small_vector: fix missing header <small_vector> which started to pop-up on latest libstc++ versions
• CMake: bump min required version to 3.10 to avoid deprecation warnings

expected: add "getters" for void value and error to help in generic code

• ufunction: allow binding to copies of source functions
• generator: improve iterator interface when yielding non-copyable items

generator: fix crash on exception when compiled with clang

Fix MinGW build for any and time_t

generator: add missing header required for latest, more stringent version of libstdc++

• New library: generator
• small_vector: return bool from shrink_to_fit
• pod_vector: return bool from resizing methods to indicate iterator invalidation
• stride_span: add ptr() to iterators for direct access to underlying pointer

Full Changelog: v1.10.3...v1.11.0

span: methods are const and noexcept as per C++20