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An
exception specification consists of the throw keyword
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followed
by a list of exception types enclosed in
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parentheses.
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The
exception specification is the last item in a function
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declaration
or function header.
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The
list may be empty.
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This
guarantees that the function will not throw any
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exceptions.
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A
non empty list guarantees that the function will only
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throw
exceptions of the type(s) specified in the list.
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If
the exception specification is absent, the function can
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throw
any type of exception.
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