Compound Attribute Rules

Notation

The notation we use is of the form:

a: A, b: B, ... --> composite-expression: composite-attribute

a, b, etc. are the operands. A, B, etc. are the operand's attribute types. composite-expression is the expression involving the operands and composite-attribute is the resulting attribute type of the composite expression.

For instance:

a: A, b: B --> (a << b): tuple<A, B>

which reads as: given, a and b are generators, and A is the type of the attribute of a, and B is the type of the attribute of b, then the type of the attribute of a << b will be tuple<A, B>.

Important

	Important
In the attribute tables, we will use `vector<A>` and `tuple<A, B...>` as placeholders only. The notation of `vector<A>` stands for any STL container holding elements of type `A` and the notation `tuple<A, B...>` stands for any Boost.Fusion sequence holding `A`, `B`, ... etc. elements. The notation of `variant<A, B, ...>` stands for a Boost.Variant capable of holding `A`, `B`, ... etc. elements. Finally, `Unused` stands for `unused_type`.

In the attribute tables, we will use vector<A> and tuple<A, B...> as placeholders only. The notation of vector<A> stands for any STL container holding elements of type A and the notation tuple<A, B...> stands for any Boost.Fusion sequence holding A, B, ... etc. elements. The notation of variant<A, B, ...> stands for a Boost.Variant capable of holding A, B, ... etc. elements. Finally, Unused stands for unused_type.

Compound Generator Attribute Types

Expression	Attribute
Sequence (`<<`) (`a << b`)	a: A, b: B --> (a << b): tuple<A, B> a: A, b: Unused --> (a << b): A a: Unused, b: B --> (a << b): B a: Unused, b: Unused --> (a << b): Unused a: A, b: A --> (a << b): vector<A> a: vector<A>, b: A --> (a << b): vector<A> a: A, b: vector<A> --> (a << b): vector<A> a: vector<A>, b: vector<A> --> (a << b): vector<A>
Alternative (`\|`) (`a \| b`)	a: A, b: B --> (a \| b): variant<A, B> a: A, b: Unused --> (a \| b): A a: Unused, b: B --> (a \| b): B a: Unused, b: Unused --> (a \| b): Unused a: A, b: A --> (a \| b): A
Kleene (`*a`)	a: A --> a: vector<A> a: Unused --> a: Unused
Plus (unary `+`) (`+a`)	a: A --> +a: vector<A> a: Unused --> +a: Unused
List (`%`) (`a % b`)	a: A, b: B --> (a % b): vector<A> a: Unused, b: B --> (a % b): Unused
Repetition (`repeat[]`)	a: A --> repeat(...,...)[a]: vector<A> a: Unused --> repeat(...,...)[a]: Unused
Optional (unary `-`) (`-a`)	a: A --> -a: optional<A> a: Unused --> -a: Unused
And predicate (unary `&`) (`&a`)	`a: A --> &a: A`
Not predicate (unary `!`) (`!a`)	`a: A --> !a: A`

Boost C++ Libraries

Compound Attribute Rules

Notation

Compound Generator Attribute Types