Re: insertion with hint

Greg Herlihy <>
Thu, 26 Jun 2008 03:57:59 CST
On Jun 25, 5:17 pm, Erik Wikstr?m <> wrote:

On 2008-06-25 13:24, wrote:

The C++ standard (ISO/IEC 14882:2003) states in table 69 (in clause
23.1.2), for the insert member with a hint:
"Complexity: logarithmic in general, but amortized constant if t is
inserted right after p."

t is the inserted object and p the hint.

If this is the case, how would I give a hint to insert t to the
beginning of an associative container ?

std::set<int> set;
set.insert(set.begin(), 1);

No, set.begin() would be the appropriate hint when when inserting a
second-placed item into an associative container. In the current C++
language Standard, there is in fact no way to specify an appropriate
hint when inserting a first placed-element into an associative
container (because there is no iterator that comes before the iterator
returned by begin()).

C++09 corrects this deficiency. In the next C++ Language Standard, the
insertion hint specifies the element that comes -after- the element
being inserted. So in C++09x, std.begin() would be the appropriate
hint when inserting an item into the beginning of an associative


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