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# Changelog for HEJ API
This log lists only changes on the HEJ API. These are primarily code changes
relevant for calling HEJ as an API. This file should only be read as an addition
to `Changes.md`, where the main features are documented.
## Version 2.X
### 2.X.0
* Made `MatrixElement.tree_kin(...)` and `MatrixElement.tree_param(...)` public
* New class `CrossSectionAccumulator` to keep track of Cross Section of the
different subproccess
* New template struct `Parameters` similar to old `Weights`
- `Weights` are now an alias for `Parameters<double>`. Calling `Weights` did
not change
- `Weights.hh` was replaced by `Parameters.hh`. The old `Weights.hh` header
- will be removed in HEJ Version 2.3.0
+ will be removed in HEJ Version 2.2.0
* Function to multiplication and division of `EventParameters.weight` by double
- This can be combined with `Parameters`, e.g.
`Parameters<EventParameters>*Weights`, see also `Events.parameters()`
- Moved `EventParameters` to `Parameters.hh` header
* Restructured `Event` class
- `Event` can now only be build from a (new) `Event::EventData` class
- Removed default constructor for `Event`
- `Event::EventData` replaces the old `UnclusteredEvent` struct.
- `UnclusteredEvent` is now deprecated, and will be removed in HEJ Version
2.3.0
- Removed `Event.unclustered()` function
- Added new member function `Events.parameters()`, to directly access
(underlying) `Parameters<EventParameters>`
- New member functions `begin_partons`, `end_partons` with aliases
`cbegin_partons`, `cend_partons` for constant iterators over
outgoing partons.
* New function `Event::EventData.reconstruct_intermediate()` to reconstruct
bosons from decays, e.g. `positron + nu_e => Wp`
* Added optional Colour charges to particles (`Particle.colour`)
- Colour connection in the HEJ limit can be generated via
`Event.generate_colours` (automatically done in the resummation)
* New abstact `EventReader` class, as base for reading events from files
- Moved LHE file reader to `HEJ::LesHouchesReader`
- New `HEJ::HDF5Reader` to read `hdf5` files
* New function `Analysis.initialise(LHEF::HEPRUP const &)` to pass `HEPRUP` to
the analysis.
* Renaming of `EventType::FixedOrder` to `EventType::non_resummable` such that Run
card is consistent with internal workings, and to avoid confusion.
## Version 2.0
### 2.0.5
* no further changes to API
### 2.0.4
* Fixed wrong path of `HEJ_INCLUDE_DIR` in `hej-config.cmake`
### 2.0.3
* no further changes to API
### 2.0.2
* no further changes to API
### 2.0.1
* no further changes to API

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