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Temporary
objects are often created by implicit type
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conversions
or when arguments are returned by value.
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When
an operator and its operands are evaluated, an
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rvalue
is often created.
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That
rvalue is a temporary on the stack that can be used
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within
a larger expression. The lifetime of the temporary
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is
from the time it is created until the end of the statement
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in
which it is used.
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While
the use of temporaries is necessary to protect the
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original
contents of the operator's operands, it does require
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additional
memory and extra (and sometimes redundant)
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copy
operations.
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