body { margin:0px; padding:0px; background:#f6f6f6; color:#000000; font-size: small; } #outer-wrapper { font:normal normal 100% 'Trebuchet MS',Trebuchet,Verdana,Sans-Serif; } a { color:#DE7008; } a:hover { color:#9E5205; } a img { border-width: 0; } #content-wrapper { padding-top: 0; padding-right: 1em; padding-bottom: 0; padding-left: 1em; } @media all { div#main { float:right; width:66%; padding-top:30px; padding-right:0; padding-bottom:10px; padding-left:1em; border-left:dotted 1px #e0ad12; word-wrap: break-word; /* fix for long text breaking sidebar float in IE */ overflow: hidden; /* fix for long non-text content breaking IE sidebar float */ } div#sidebar { margin-top:20px; margin-right:0px; margin-bottom:0px; margin-left:0; padding:0px; text-align:left; float: left; width: 31%; word-wrap: break-word; /* fix for long text breaking sidebar float in IE */ overflow: hidden; /* fix for long non-text content breaking IE sidebar float */ } } @media handheld { div#main { float:none; width:90%; } div#sidebar { padding-top:30px; padding-right:7%; padding-bottom:10px; padding-left:3%; } } #header { padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; border-bottom:dotted 1px #e0ad12; background:#F5E39e; } h1 a:link { text-decoration:none; color:#F5DEB3 } h1 a:visited { text-decoration:none; color:#F5DEB3 } h1,h2,h3 { margin: 0; } h1 { padding-top:25px; padding-right:0px; padding-bottom:10px; padding-left:5%; color:#F5DEB3; background:#DE7008; font:normal bold 300% Verdana,Sans-Serif; letter-spacing:-2px; } h3.post-title { color:#9E5205; font:normal bold 160% Verdana,Sans-Serif; letter-spacing:-1px; } h3.post-title a, h3.post-title a:visited { color: #9E5205; } h2.date-header { margin-top:10px; margin-right:0px; margin-bottom:0px; margin-left:0px; color:#777777; font: normal bold 105% 'Trebuchet MS',Trebuchet,Verdana,Sans-serif; } h4 { color:#aa0033; } #sidebar h2 { color:#B8A80D; margin:0px; padding:0px; font:normal bold 150% Verdana,Sans-serif; } #sidebar .widget { margin-top:0px; margin-right:0px; margin-bottom:33px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; font-size:95%; } #sidebar ul { list-style-type:none; padding-left: 0; margin-top: 0; } #sidebar li { margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; list-style-type:none; font-size:95%; } .description { padding:0px; margin-top:7px; margin-right:12%; margin-bottom:7px; margin-left:5%; color:#9E5205; background:transparent; font:bold 100% Verdana,Sans-Serif; } .post { margin-top:0px; margin-right:0px; margin-bottom:30px; margin-left:0px; } .post strong { color:#000000; font-weight:bold; } pre,code { color:#999999; } strike { color:#999999; } .post-footer { padding:0px; margin:0px; color:#444444; font-size:80%; } .post-footer a { border:none; color:#968a0a; text-decoration:none; } .post-footer a:hover { text-decoration:underline; } #comments { padding:0px; font-size:110%; font-weight:bold; } .comment-author { margin-top: 10px; } .comment-body { font-size:100%; font-weight:normal; color:black; } .comment-footer { padding-bottom:20px; color:#444444; font-size:80%; font-weight:normal; display:inline; margin-right:10px } .deleted-comment { font-style:italic; color:gray; } .comment-link { margin-left:.6em; } .profile-textblock { clear: both; margin-left: 0; } .profile-img { float: left; margin-top: 0; margin-right: 5px; margin-bottom: 5px; margin-left: 0; border: 2px solid #DE7008; } #sidebar a:link { color:#999999; text-decoration:none; } #sidebar a:active { color:#ff0000; text-decoration:none; } #sidebar a:visited { color:sidebarlinkcolor; text-decoration:none; } #sidebar a:hover { color:#B8A80D; text-decoration:none; } .feed-links { clear: both; line-height: 2.5em; } #blog-pager-newer-link { float: left; } #blog-pager-older-link { float: right; } #blog-pager { text-align: center; } .clear { clear: both; } .widget-content { margin-top: 0.5em; } /** Tweaks for layout editor preview */ body#layout #outer-wrapper { margin-top: 0; } body#layout #main, body#layout #sidebar { margin-top: 10px; padding-top: 0; } -->

Tuesday, January 13, 2009

Use unary_function when delete objet in STL container.

This post copied from Effective STL.
Usually, many developer still delete object in STL container via iterating container and delete.
This method possibility makes exceptions and not effective way for STL.
From now on, use unary_function with for_each.

template <typename T>
class ContainerDeallocator : unary_function<T, void>
{
public:
void operator () (const T* ptr) const
{
delete ptr;
}
};



vector<int*> v1;
v1.resize(10);
v1[0] = new int(10);
v1[1] = new int(18);
v1[2] = new int(67);
v1[3] = new int(5);

for_each(v1.begin(), v1.end(), ContainerDeallocator<int>());

It's more pretty than using iterator.

Reference : Effective STL -Meyers-

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