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| <TITLE>min_element()</TITLE> |
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| <A HREF="min.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="minus.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library Reference Guide</B></DIV> |
| <H2>min_element()</H2> |
| <P><B>Library:</B> <A HREF="2-9.html">Algorithms</A></P> |
| |
| <PRE><HR><B><I>Function</I></B><HR></PRE> |
| |
| <UL> |
| <LI><A HREF="#sec1">Local Index</A></LI> |
| <LI><A HREF="#sec2">Summary</A></LI> |
| <LI><A HREF="#sec3">Synopsis</A></LI> |
| <LI><A HREF="#sec4">Description</A></LI> |
| <LI><A HREF="#sec5">Complexity</A></LI> |
| <LI><A HREF="#sec6">Example</A></LI> |
| <LI><A HREF="#sec7">See Also</A></LI> |
| <LI><A HREF="#sec8">Standards Conformance</A></LI> |
| </UL> |
| <A NAME="sec1"><H3>Local Index</H3></A> |
| No Entries |
| <A NAME="sec2"><H3>Summary</H3></A> |
| <P>Algorithm that finds the minimum value in a range</P> |
| <A NAME="sec3"><H3>Synopsis</H3></A> |
| |
| <PRE>#include <algorithm> |
| |
| namespace std { |
| template <class ForwardIterator> |
| ForwardIterator |
| min_element(ForwardIterator start, ForwardIterator finish); |
| |
| template <class ForwardIterator, class Compare> |
| InputIterator |
| min_element(ForwardIterator start, ForwardIterator finish, |
| Compare comp); |
| } |
| </PRE> |
| <A NAME="sec4"><H3>Description</H3></A> |
| <P>The <SAMP>min_element()</SAMP> algorithm returns an iterator that denotes the minimum element in a sequence. If the sequence contains more than one copy of the minimum element, the iterator points to the first occurrence of the element. In the second version of the function, the argument <SAMP>comp</SAMP> defines a comparison function object to be used in place of <SAMP>operator<()</SAMP>.</P> |
| <P>Algorithm <SAMP>min_element()</SAMP> returns the first iterator <SAMP>i</SAMP> in the range <SAMP>[start, finish)</SAMP> such that for any iterator <SAMP>j</SAMP> in the same range, either of the following conditions hold:</P> |
| <P><SAMP>!(*j < *i)</SAMP></P> |
| <P>or</P> |
| <P><SAMP>comp(*j, *i) == false. </SAMP></P> |
| <A NAME="sec5"><H3>Complexity</H3></A> |
| <P><SAMP>min_element()</SAMP> performs exactly <SAMP>max((finish - start) - 1, 0)</SAMP> applications of the corresponding comparisons.</P> |
| <A NAME="sec6"><H3>Example</H3></A> |
| |
| <UL><PRE>// |
| // max_elem.cpp |
| // |
| |
| #include <algorithm> // for max_element |
| #include <functional> // for less |
| #include <iostream> // for cout, endl |
| #include <vector> // for vector |
| |
| |
| int main () |
| { |
| typedef std::vector<int, std::allocator<int> > Vector; |
| typedef Vector::iterator Iterator; |
| |
| const Vector::value_type d1[] = { 1, 3, 5, 32, 64 }; |
| // Set up vector. |
| Vector v1(d1 + 0, d1 + sizeof d1 / sizeof *d1); |
| |
| // Find the largest element in the vector. |
| Iterator it1 = std::max_element (v1.begin(), v1.end()); |
| |
| // Find the largest element in the range from |
| // the beginning of the vector to the 2nd to last. |
| Iterator it2 = std::max_element (v1.begin(), v1.end() - 1, |
| std::less<int>()); |
| |
| // Find the smallest element. |
| Iterator it3 = std::min_element (v1.begin(), v1.end()); |
| |
| // Find the smallest value in the range from |
| // the beginning of the vector plus 1 to the end. |
| Iterator it4 = std::min_element (v1.begin() + 1, v1.end(), |
| std::less<int>()); |
| |
| std::cout << *it1 << " " << *it2 << " " |
| << *it3 << " " << *it4 << std::endl; |
| |
| return 0; |
| } |
| |
| |
| Program Files: |
| </PRE></UL> |
| <UL><PRE>64 32 1 3 |
| </PRE></UL> |
| <A NAME="sec7"><H3>See Also</H3></A> |
| <P><SAMP><A HREF="max.html">max()</A></SAMP>, <SAMP><A HREF="max-element.html">max_element()</A></SAMP>, <SAMP><A HREF="min.html">min()</A></SAMP></P> |
| <A NAME="sec8"><H3>Standards Conformance</H3></A> |
| <P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 25.3.7</I></P> |
| |
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