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TH — Fri, 11 Aug 2006 14:27:00 GMT

摘要: OpenGL 中场景进行变换，要经历一些过�E�：视图变换 à 模型变换 à 投媄变换�Q�然后到了窗口坐标。这几个变换开始的时候把我搞很�؜�Q�这几天整理一下�? 一般书上把�q�几个变换用照相机类比，其实每个变换都是产生着一�?... 阅读全文

TH 2006-08-11 22:27 发表评论

TH — Fri, 02 Jun 2006 04:03:00 GMT

下面�q�段引文可对左倹{��右值加��q��解�?br />
参考文献：《ANSI/ISO C++ Professional Programmer's Handbook�?/p>

lvalues and rvalues
An object is a contiguous region of storage. An lvalue is an expression that refers to such an object. The original
definition of lvalue referred to an object that can appear on the left-hand side of an assignment. However, const
objects are lvalues that cannot be used in the left-hand side of an assignment. Similarly, an expression that can appear
in the right-hand side of an expression (but not in the left-hand side of an expression) is an rvalue. For example

#include < string >
using namespace std;
int & f();
void func()
{
     int n;
     char buf[ 3 ];
    n = 5 ; // n is an lvalue; 5 is an rvalue
    buf[ 0 ] = ' a ' ; // buf[0] is an lvalue, 'a' is an rvalue
     string s1 = " a " , s2 = " b " , s3 =    " c " ; // "a", "b", "c" are rvalues
    s1 = // lvalue
    s2 + s3; // s2 and s3 are lvalues that are  implicitly converted to rvalues
    s1 = // lvalue
     string ( " z " ); // temporaries are rvalues
     int * p = new int ; // p is an lvalue; 'new int' is an rvalue
    f() = 0 ; // a function call that returns a reference is an lvalue
     s1.size(); // otherwise, a function call is an rvalue expression
}

An lvalue can appear in a context that requires an rvalue; in this case, the lvalue is implicitly converted to an rvalue.
An rvalue cannot be converted to an lvalue. Therefore, it is possible to use every lvalue expression in the example as
an rvalue, but not vice versa.

TH 2006-06-02 12:03 发表评论

TH — Tue, 30 May 2006 03:36:00 GMT

现在有个困惑�Q�不知道博客怎么写。既然是个专业性的博客�Q�就不敢再这里�ؕ写�?br />对博客定位的问题�Q�我也思考数日。觉得博客可以有两个分类�?br />1�? 作�ؓ初学者学习的成长历程。从hello world开始。当�Ӟ��至于最后能��这个历�E�走到哪里，却不得而知了。更甚者，不知是按部就班，一步一步学�Q�还是心血来潮�Q�想到哪里学哪里�?br />2 �?作�ؓ一个专题性的主题讨论。提��Z��个问题，解决它，再谈论，改进。这��L(f��ng)��一个好处就是能寚w��题有清晰的认识和解决问题能力的也会提高。主题来来源可以是别人的博客上的subject�Q��^旉��到的问题�Q�解决问题时候出来的新问题等�{��?br />
写博克的形式�Q�我惛_��致可以以上面两种�?br />更关心的问题是，我们在写博客的过�E�中能得��C��么？��x��得利益所得。这也同��h��能否�l�箋写下�ȝ��一个驱动力�?br />可以得到的，我想可以有：�Q�、能力积累。分析、解决问题的能力�?br />　　　　　　　 �Q�、技术积累。技术知识的扩张�?br />　　　　　　 �Q�、代码积累。算法、编�E�技巧的�U�淀(w��n)。同时可以�ؓ创新作积累。　
　　　　　　　　　　　　�Q�、技术会友。有朋自�q�方来．�Q�．　　

�q�是我对卛_��开张的博客的一些想法，请多多指教�?br />

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TH 2006-05-30 11:36 发表评论

��C�h报到

TH — Sun, 28 May 2006 06:16:00 GMT

大家�?
我是TH。来自杭州，致力于C++和图形学�{�方面。请多多指教�?img src ="http://m.shnenglu.com/bch515/aggbug/7769.html" width = "1" height = "1" />

TH 2006-05-28 14:16 发表评论