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Name
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Expression
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Precondition
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Semantics
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Postcondition
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Range constructor
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X(i, j)
X a(i, j);
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[i,j) is a valid range.
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Creates an associative container that contains all of the elements in the range [i,j)
that have unique keys.
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size() is less than or equal to the distance from i to j.
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Insert element
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a.insert(t)
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Inserts t into a if and only if a does not already contain an
element whose key is the same as the key of t. The return value
is a pair P. P.first is an iterator pointing to the
element whose key is the same as the key of t. P.second is
a bool: it is true if t was actually inserted into a, and
false if t was not inserted into a, i.e. if a already
contained an element with the same key as t.
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P.first is a dereferenceable iterator. *(P.first) has the same
key as t. The size of a is incremented by 1 if and only if
P.second is true.
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Insert range
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a.insert(i, j)
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[i, j) is a valid range.
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Equivalent to a.insert(t) for each object t that is pointed to
by an iterator in the range [i, j). Each element is inserted into
a if and only if a does not already contain an element with
the same key.
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The size of a is incremented by at most j - i.
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Count
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a.count(k)
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Returns the number of elements in a whose keys are the same as k.
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The return value is either 0 or 1.
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