These functions create types for the Rsymbolic type system, called sTypes
from here on. These functions are used mostly in literal expressions denoting sTypes.
st creates a base sType from a string. A base sType is a type without
any further structure. Example include
%->% creates a function sType, i.e. the type of function, from a
vector of argument sTypes and a result sType. A function sType has
range containing its argument and result types.
Every sType has a
string field containing a unambiguous string representation
that can serve as a hash table key.
STypes can be checked for equality via
sObject is the root of the sType hierarchy, i.e. the most general type.
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The name of the base sType to create.
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The created sType.
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