Unified expression and location framework

A computer program product comprising one of more computer-readable media having thereon computer-executable instructions that, when executed by a computing system capable of running a continuation based runtime, causes the computing system to perform a method for allowing the continuation based runtime to resolve value expressions of multiple value expression classes, the method comprising:

• an act of providing multiple value expression classes, each value expression class used to resolve a respective distinct category of value expressions into a value in the continuation based runtime, at least some of the multiple value classes having a common method that may be used to cause instances of the respective value expression class to resolve expressions to a value;
• an act of an object instance receiving a request to resolve a value expression of a particular type using the common method;
• and
• an act of the object instance responding to the request by returning a resolved value of the value expression.

A computer program product comprising one of more computer-readable media having thereon computer-executable instructions that, when executed by a computing system capable of running a continuation based runtime, causes the computing system to perform a method for allowing the continuation based runtime to resolve multiple location classes, the method comprising:

• an act of providing multiple location classes, each location class used as a proxy of a distinct type for accessing underlying data in a continuation based runtime;
• an act of responding to a first request to a first object of a first location class using a first data access mechanism to return first data that is stored in a first manner in a first storage environment;
• and
• an act of responding to a second request to a second object of a second location class using a second data access mechanism to return second data that is stored in a second manner in a second storage environment, wherein at least one of the following pairs of items is different:
• 1) the first and second data access mechanism,
• 2) the first and second storage manner, and
• 3) the first and second storage environment.