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| <TITLE>fill(), fill_n()</TITLE> |
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| <H2>fill(), fill_n()</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 assigns the same value to the elements in a given range</P> |
| <A NAME="sec3"><H3>Synopsis</H3></A> |
| |
| <PRE>#include <algorithm> |
| |
| namespace std { |
| template <class ForwardIterator, class T> |
| void fill(ForwardIterator start, ForwardIterator finish, |
| const T& value); |
| |
| template <class OutputIterator, class Size, class T> |
| void fill_n(OutputIterator start, Size n, const T& value); |
| } |
| </PRE> |
| <A NAME="sec4"><H3>Description</H3></A> |
| <P>The <SAMP>fill()</SAMP> and <SAMP><A HREF="fill.html">fill_n()</A></SAMP> algorithms are used to assign a value to the elements in a sequence. <SAMP>fill()</SAMP> assigns the value to all the elements designated by iterators in the range <SAMP>[start, finish)</SAMP>.</P> |
| <P>The <SAMP><A HREF="fill.html">fill_n()</A></SAMP> algorithm assigns the value to all the elements designated by iterators in the range <SAMP>[start, start + n)</SAMP>. <SAMP>fill_n()</SAMP> assumes that all iterators in the range <SAMP>[start, start + n)</SAMP> are dereferenceable, unless <SAMP>start</SAMP> is an insert iterator.</P> |
| <P>Type <SAMP>T</SAMP> must be Assignable, and <SAMP>Size</SAMP> must be convertible to an integral type.</P> |
| <A NAME="sec5"><H3>Complexity</H3></A> |
| <P><SAMP>fill()</SAMP> makes exactly <SAMP>finish - start</SAMP> assignments, and <SAMP><A HREF="fill.html">fill_n()</A></SAMP> makes exactly <SAMP>n</SAMP> assignments.</P> |
| <A NAME="sec6"><H3>Example</H3></A> |
| |
| <UL><PRE>// |
| // fill.cpp |
| // |
| |
| #include <algorithm> |
| #include <iostream> |
| #include <vector> |
| |
| |
| |
| int main () |
| { |
| // Typedef for convenience. |
| typedef std::vector<int, std::allocator<int> > vector; |
| |
| const vector::value_type arr[] = { 1, 2, 3, 4 }; |
| |
| // Set up two vectors. |
| vector v1(arr, arr + sizeof arr / sizeof *arr); |
| vector v2(v1.begin (), v1.end ()); |
| |
| // Set up one empty vector. |
| vector v3; |
| |
| // Fill all of v1 with 9. |
| std::fill(v1.begin (), v1.end (), 9); |
| |
| // Fill first 3 of v2 with 7. |
| std::fill_n(v2.begin (), 3, 7); |
| |
| // Use insert iterator to fill v3 with 5 11's. |
| std::fill_n(std::back_inserter (v3), 5, 11); |
| |
| // Copy all three to cout. |
| std::ostream_iterator<vector::value_type, char, |
| std::char_traits<char> > out(std::cout, " "); |
| |
| std::copy(v1.begin (), v1.end (), out); |
| std::cout << std::endl; |
| |
| std::copy(v2.begin (), v2.end (), out); |
| std::cout << std::endl; |
| |
| std::copy(v3.begin (), v3.end (), out); |
| std::cout << std::endl; |
| |
| // Fill cout with 3 5's. |
| std::fill_n(out, 3, 5); |
| std::cout << std::endl; |
| |
| return 0; |
| } |
| |
| |
| Program Output |
| </PRE></UL> |
| <UL><PRE>9 9 9 9 |
| 7 7 7 4 |
| 11 11 11 11 11 |
| 5 5 5 |
| </PRE></UL> |
| <A NAME="sec7"><H3>See Also</H3></A> |
| <P><A HREF="algorithms.html">Algorithms</A></P> |
| <A NAME="sec8"><H3>Standards Conformance</H3></A> |
| <P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 25.2.5</I></P> |
| |
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