Give collection_size_type explicit increment, decrement, and stream extractor - #358
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…xtractor `collection_size_type` had no increment, decrement, or stream extractor but had an implicit conversion to a modifiable reference to its stored size (`operator base_type &`) which allowed the built-in operators to apply. Remove that mutable-reference conversion and provide the operations the library actually needs explicitly: pre/post `++` and `--`, and an `operator>>` for input (templated on the character type, so it serves narrow and wide text and XML archives). The read-only `operator base_type() const` is kept: output, container sizing, and comparisons go through it, so no call sites change. The on-disk format is unchanged. Binary archives already serialize the type bitwise; text and XML still read and write the same size through `is >> x` / `os << x`. Adds test_collection_size_type, which checks the operators directly and round-trips a value through every archive type. Closes #192.
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collection_size_typehad no increment, decrement, or stream extractor but had an implicit conversion to a modifiable reference to its stored size (operator base_type &) which allowed the built-in operators to apply.Remove that mutable-reference conversion and provide the operations the library actually needs explicitly: pre/post
++and--, and anoperator>>for input (templated on the character type, so it serves narrow and wide text and XML archives). The read-onlyoperator base_type() constis kept: output, container sizing, and comparisons go through it, so no call sites change.The on-disk format is unchanged. Binary archives already serialize the type bitwise; text and XML still read and write the same size through
is >> x/os << x.Adds test_collection_size_type, which checks the operators directly and round-trips a value through every archive type.
Closes #192.