This program illustrates the member function max_size() and shows how the
maximum size of a map depends on its component type.
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Here are the maximum sizes of several maps of different component types:

Maximum size of a map<int, int> ..........  536870911
Maximum size of a map<int, double> .......  268435455
Maximum size of a map<int, char> .........  536870911
Maximum size of a map<string, double> ....  107374182
Maximum size of a map<string, BigThing> ..        531

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