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doc(library/type_context): explain why we need tmp_local_generator

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Leonardo de Moura 2015-12-15 18:58:07 -08:00
parent 73b28c91a6
commit 70f71a18c8
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8
src/library/type_context.h
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@ -16,6 +16,14 @@ namespace lean {
unsigned get_class_instance_max_depth(options const & o);
bool get_class_trans_instances(options const & o);
/** \brief Many procedures need to create temporary local constants.
So, in the type_context class we provide this capability.
It is just a convenience, and allows many procedures to have a simpler
interface. Example: no need to take a type_context AND a name_generator.
However, in some procedures (e.g., simplifier) use multiple type_context
objects, and they want to make sure the local constants created by them
are distinct. So, we can accomplish that by providing the same
tmp_local_generator to different type_context objects. */
class tmp_local_generator {
unsigned m_next_local_idx;
name mk_fresh_name();