0.9.0

Full Changelog

Great closure/adaptor rework

• BREAKING! sink and fork introduced in 0.8.0 are removed because they don't
  fit into the library and lead to a lot of complicated logic to support them
• BREAKING! ureact::closure is renamed and moved in ureact::detail namespace
  library is not ready for such extension point yet
• BREAKING! free functions that create new reactives (signals/events/observes)
  from existing ones also called "algorithms" are replaced with inline constexpr
  instances of special functor-like classes inherited from Adaptor or AdaptorClosure.
  This is the same approach as used in std::ranges and range-v3.
  There are some differences in usage compared with free functions:
  • Argument-dependent lookup
    is not working with adaptors, so namespace is required, while before it was optional

  ureact::context ctx;
  ureact::var_signal<int> src = make_var( ctx, 1 );
  
  // before 0.9.0
  ureact::signal<int> minus_src = lift( src, std::negate<>{} );
  
  // after 0.9.0
  ureact::signal<int> minus_src = ureact::lift( src, std::negate<>{} );

  • single argument adaptors like ureact::monitor and ureact::count no longer
    require functional call scopes

  ureact::context ctx;
  ureact::var_signal src = make_var( ctx, 1 );
  
  // before 0.9.0
  ureact::signal changes = src | ureact::monitor() | ureact::count();
  
  // after 0.9.0
  ureact::signal changes = src | ureact::monitor | ureact::count;

  • unlike free functions, adaptors can't have optional template arguments, so
    new adaptors with underscopes are introduced for such cases, because <>
    would be required for default case.

  ureact::context ctx;
  ureact::event_source<int> src = make_source<int>( ctx );
  
  // before 0.9.0
  ureact::signal<size_t> changes = src | ureact::count();
  ureact::signal<float> changes_f = src | ureact::count<float>();
  
  // after 0.9.0
  ureact::signal<size_t> changes = src | ureact::count;
  ureact::signal<float> changes_f = src | ureact::count_<float>;

• BREAKING! yet another great headers rework:
  • ureact/take_drop.hpp is separated into
    ureact/take.hpp and ureact/drop.hpp
  • ureact/take_drop_while.hpp is separated into
    ureact/take_while.hpp and ureact/drop_while.hpp
  • all adaptors are moved into ureact/adaptor subdirectory.
    As a result library headers become easier to navigate.
• New adaptor ureact::once is introduced.
  Or reintroduced, because it was added before and then removed in 0.6.0.
  It is merely a ureact::take(1) overload with more precise name.
• ureact::signal_pack is reworked to hold tuple of signals
  instead of tuple of signal references.
  It reduces space for errors and reduces artificial complexity
  when working with signal_pack with a tiny cost of copying shared
  pointers on reactive value construction.