docs/archapi.md


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Each architecture must implement the following types and APIs.

The syntax `const_range<T>` is used to denote anything that has a `begin()` and `end()` method that return const forward iterators. This can be a `std::list<T>`, `std::vector<T>`, a (const) reference to those, or anything else that behaves in a similar way.

archdefs.h
==========

The architecture-specific `archdefs.h` must define the following types.

With the exception of `ArchNetInfo` and `ArchCellInfo`, the following types should be "lightweight" enough so that passing them by value is sensible.

### delay\_t

A scalar type that is used to  represent delays. May be an integer or float type.

### DelayInfo

A struct representing the delay across a timing arc. Must provide a `+` operator for getting the combined delay of two arcs, and the following methods to access concrete timings:

```
delay_t minRaiseDelay() const { return delay; }
delay_t maxRaiseDelay() const { return delay; }

delay_t minFallDelay() const { return delay; }
delay_t maxFallDelay() const { return delay; }

delay_t minDelay() const { return delay; }
delay_t maxDelay() const { return delay; }
```

### BelId

A type representing a bel name. `BelId()` must construct a unique null-value. Must provide `==`, `!=`, and `<` operators and a specialization for `std::hash<BelId>`.

### WireId

A type representing a wire name. `WireId()` must construct a unique null-value. Must provide `==`, `!=`, and `<` operators and a specialization for `std::hash<WireId>`.

### PipId

A type representing a pip name. `PipId()` must construct a unique null-value. Must provide `==`, `!=`, and `<` operators and a specialization for `std::hash<PipId>`.

### GroupId

A type representing a group name. `GroupId()` must construct a unique null-value. Must provide `==` and `!=` operators and a specialization for `std::hash<GroupId>`.

### DecalId

A type representing a reference to a graphical decal. `DecalId()` must construct a unique null-value. Must provide `==` and `!=` operators and a specialization for `std::hash<DecalId>`.