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Diffstat (limited to 'docs/ProgrammersManual.html')
| -rw-r--r-- | docs/ProgrammersManual.html | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/docs/ProgrammersManual.html b/docs/ProgrammersManual.html index 82b263845c..1d207bebbf 100644 --- a/docs/ProgrammersManual.html +++ b/docs/ProgrammersManual.html @@ -970,6 +970,15 @@ assembly parser, and linker also have to be aware of the inner workings of this system. </p> +<p> +For our purposes below, we need three concepts. First, an "Opaque Type" is +exactly as defined in the <a href="LangRef.html#t_opaque">language +reference</a>. Second an "Abstract Type" is any type which includes an +opaque type as part of its type graph (for example "<tt>{ opaque, int }</tt>"). +Third, a concrete type is a type that is not an abstract type (e.g. "<tt>[ int, +float }</tt>"). +</p> + </div> <!-- ______________________________________________________________________ --> @@ -1093,8 +1102,8 @@ changes.</p> To support this, a class can derive from the AbstractTypeUser class. This class allows it to get callbacks when certain types are resolved. To register to get callbacks for a particular type, the DerivedType::{add/remove}AbstractTypeUser -methods can be called on a type. Note that these methods only work for {\em -abstract} types. Concrete types (those that do not include an opaque objects +methods can be called on a type. Note that these methods only work for <i> +abstract</i> types. Concrete types (those that do not include an opaque objects somewhere) can never be refined. </p> </div> |