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Closures/Value capture: Difference between revisions
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calls the function represented by that lambda-expression. Since it does not give the function any arguments, <code>a</code> and <code>b</code> get their default values (which are the values captured by <code>freeze</code>).
(Although code within such a 'closure' can assign new values to the captured variables, it would have only a temporary effect and would not change the values seen in subsequent calls to the same closure. That's one sense in which the variable values are "frozen".)
Here is the definition of <code>freeze</code>:
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