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Rewrote iota_n to use pre-increment instead of post - now the same as iota. Added a test for 0 as well.

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[SVN r85465]
This commit is contained in:
Marshall Clow
2013-08-25 16:29:01 +00:00
parent fc0fe6af52
commit fe51eb60a9
2 changed files with 8 additions and 4 deletions
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4
include/boost/algorithm/cxx11/iota.hpp
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@ -63,8 +63,8 @@ void iota ( Range &r, T value )
template <typename OutputIterator, typename T> template <typename OutputIterator, typename T>
OutputIterator iota_n ( OutputIterator out, T value, std::size_t n ) OutputIterator iota_n ( OutputIterator out, T value, std::size_t n )
{ {
while ( n-- > 0 ) for ( ; n > 0; --n, ++value )
*out++ = value++; *out++ = value;
return out; return out;
} }

8
test/iota_test1.cpp
View File

@ -42,11 +42,11 @@ void test_ints () {
std::vector<int> v; std::vector<int> v;
std::list<int> l; std::list<int> l;
v.clear (); v.reserve ( 10 ); v.clear (); v.resize ( 10 );
boost::algorithm::iota ( v.begin (), v.end (), 23 ); boost::algorithm::iota ( v.begin (), v.end (), 23 );
BOOST_CHECK ( test_iota_results ( v.begin (), v.end (), 23 )); BOOST_CHECK ( test_iota_results ( v.begin (), v.end (), 23 ));
v.clear (); v.reserve ( 19 ); v.clear (); v.resize ( 19 );
boost::algorithm::iota ( v, 18 ); boost::algorithm::iota ( v, 18 );
BOOST_CHECK ( test_iota_results ( v, 18 )); BOOST_CHECK ( test_iota_results ( v, 18 ));
@ -54,6 +54,10 @@ void test_ints () {
boost::algorithm::iota_n ( std::back_inserter(v), 99, 20 ); boost::algorithm::iota_n ( std::back_inserter(v), 99, 20 );
BOOST_CHECK ( test_iota_results ( v, 99 )); BOOST_CHECK ( test_iota_results ( v, 99 ));
v.clear ();
boost::algorithm::iota_n ( std::back_inserter(v), 99, 0 );
BOOST_CHECK ( v.size() == 0 );
/* /*
l.clear (); l.reserve ( 5 ); l.clear (); l.reserve ( 5 );
boost::algorithm::iota ( l.begin (), l.end (), 123 ); boost::algorithm::iota ( l.begin (), l.end (), 123 );