## 0.6.0

### Breaking Changes

* The `semmle.code.cpp.commons.Buffer` and `semmle.code.cpp.commons.NullTermination` libraries no longer expose `semmle.code.cpp.dataflow.DataFlow`. Please import `semmle.code.cpp.dataflow.DataFlow` directly.

### Deprecated APIs

* The `WriteConfig` taint tracking configuration has been deprecated. Please use `WriteFlow`.

### New Features

* Added support for merging two `PathGraph`s via disjoint union to allow results from multiple data flow computations in a single `path-problem` query.

### Major Analysis Improvements

* A new C/C++ dataflow library (`semmle.code.cpp.dataflow.new.DataFlow`) has been added.
  The new library behaves much more like the dataflow library of other CodeQL supported
  languages by following use-use dataflow paths instead of def-use dataflow paths.
  The new library also better supports dataflow through indirections, and new predicates
  such as `Node::asIndirectExpr` have been added to facilitate working with indirections.

  The `semmle.code.cpp.ir.dataflow.DataFlow` library is now identical to the new
  `semmle.code.cpp.dataflow.new.DataFlow` library.
* The main data flow and taint tracking APIs have been changed. The old APIs
  remain in place for now and translate to the new through a
  backwards-compatible wrapper. If multiple configurations are in scope
  simultaneously, then this may affect results slightly. The new API is quite
  similar to the old, but makes use of a configuration module instead of a
  configuration class.

### Minor Analysis Improvements

* Deleted the deprecated `hasGeneratedCopyConstructor` and `hasGeneratedCopyAssignmentOperator` predicates from the `Folder` class.
* Deleted the deprecated `getPath` and `getFolder` predicates from the `XmlFile` class.
* Deleted the deprecated `getMustlockFunction`, `getTrylockFunction`, `getLockFunction`, and `getUnlockFunction` predicates from the `MutexType` class.
* Deleted the deprecated `getPosInBasicBlock` predicate from the `SubBasicBlock` class.
* Deleted the deprecated `getExpr` predicate from the `PointerDereferenceExpr` class.
* Deleted the deprecated `getUseInstruction` and `getDefinitionInstruction` predicates from the `Operand` class.
* Deleted the deprecated `isInParameter`, `isInParameterPointer`, and `isInQualifier` predicates from the `FunctionInput` class.
* Deleted the deprecated `isOutParameterPointer`, `isOutQualifier`, `isOutReturnValue`, and `isOutReturnPointer` predicate from the `FunctionOutput` class.
* Deleted the deprecated 3-argument `isGuardPhi` predicate from the `RangeSsaDefinition` class.