# OpenSTA, Static Timing Analyzer
# Copyright (c) 2025, Parallax Software, Inc.
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This file summarizes STA API changes for each release.

Release 2.6.2 2024/03/30
------------------------

The following functions have been renamed to to_string and return std::string
instead of "const char*"

  Vertex::name
  FuncExpr::asString
  TimingRole::name
  MinMax::asString
  MinMaxAll::asString
  RiseFall::asString
  RiseFallBoth::asString
  Transition::asString
  Tag::asString
  timingSenseString

The following classes now return const objects.

  MinMax
  MinMaxAll
  RiseFall
  RiseFallBoth
  Transition
  TimingRole

Release 2.6.1 2025/03/??
-------------------------

The following classes have been replaced by the class Path.
 PathEnumed
 PathPrev
 PathRef
 PathVertex
 PathVertexPtr
 PathVertexRep

The PathExpanded::prevArc function has been removed. Use Path::prevArc instead.

Release 2.4.0 2023/01/19
-------------------------

The Network API and associated containers now 'const' the network class objects.
The Network API now requires network objects to have and "id" function that
returns an ObjectId (unsigned int) that is unique to the object among objects
of the same type. 

  virtual ObjectId id(const Instance *instance) const = 0;

Object IDs are used for comparing and hashing network objects.
If network Ids are not available in the host application database object pointers
can be cast to intptr_t. Using pointers as object Ids can result in memory layout
dependent results that are inconsistent from run to run or across host systems.

Many Network and Sta class functions now return collections rather than pointers
to temporary collections that the caller would have to delete.

Release 2.3.1 2022/06/12
-------------------------
LibertyCellTimingArcSetIterator has been removed.
Use range iteration as shown below:
  for (TimingArcSet *arc_set : cell->timingArcSets())
  for (TimingArcSet *arc_set : cell->timingArcSets(from, to))

TimingArcSetArcIterator has been removed.
Use range iteration as shown below:
 for (TimingArc *arc : arc_set->arcs())

LibertyCellSequentialIterator has been removed.
  for (Sequential *seq : cell->sequentials())

Release 2.1.1 2020/12/13
-------------------------
Report::error, Report::warn functions now take a unique message ID as a first argument.
InternalError has been renamed Report::cricical.

Release 2.1.0 2020/04/05
-------------------------
All public headers files have been moved to include/sta.

The following iterators have been removed.
Use range iteration on the returned collection shown next to them instead.
  LibertyCellInternalPowerIterator cell->internalPowers()
  LibertyCellLeakagePowerIterator cell->leakagePowers()

Release 2.0.18 2020/02/15
-------------------------

The following iterator functions are deprecated:

 TimingArcSet::timingArcIterator()
 Sdc::clockIterator()

Use the iterator class constructor instead. This avoids new/deletes of
the iterators by stack allocating them. For example,
Instead of

  TimingArcSetArcIterator *arc_iter = arc_set->timingArcIterator();
  while (arc_iter->hasNext()) {
    TimingArc *arc = arc_iter->next();
  }
  delete arc_iter;

use the following:

  TimingArcSetArcIterator arc_iter(arc_set);
  while (arc_iter.hasNext()) {
    TimingArc *arc = arc_iter.next();
  }

StaException renamed to Exception

Release 2.0.17 2019/11/11
-------------------------

Network::setVertexIndex renamed to setVertexId
Network::vertexIndex renamed to vertexId

TransRiseFall renamed to RiseFall
TransRiseFallBoth renamed to RiseFallBoth

Release 2.0.0 2018/06/11
-------------------------

Initial release.
	
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