结构问题 [英] struct problem
问题描述
有人请你这么好解释：
有人请你这么好解释：
struct Vertex
{
Vertex（）{}
顶点（float x，float y，float z，
float nx，float ny，float nz，float u，float v）
{
_x = x; _y = y; _z = z;
_nx = nx; _ny = ny; _nz = nz;
_u = u; _v = v;
}
float _x，_y，_z，_nx，_ny，_nz，_u，_v;
static const DWORD FVF;
};
这究竟是什么：？！？！？！
顶点（）{}
顶点（浮点x，浮点数y，浮点数z，
浮点数nx，浮点数ny，浮点数nz，浮点数u，浮点数v）
{
_x = x; _y = y; _z = z;
_nx = nx; _ny = ny; _nz = nz;
_u = u; _v = v;
}
是vertex（）{}函数吗？一个变量。有人至少可以给我一个名字
这里发生了什么，所以我知道该找什么？
欢呼
dave
文章< 3f ****** @ dnews.tpgi.com.au>，
Dave< da ********************************** @ hotmail.co m>写道：有人请你这么好解释：
struct Vertex
{Vertex（）{}
Vertex（float x，float y，float z，
float nx，float ny，float nz，float u，float v）
{
_x = x; _y = y; _z = z;
_nx = nx; _ny = ny; _nz = nz;
_u = u; _v = v;
}
浮_x，_y，_z，_nx，_ny，_nz，_u，_v;
静态const DWORD FVF;
};
[snip]是vertex（）{}一个函数？
这是一个不带参数/参数的构造函数，什么都不做。 />
它允许你声明一个Vertex类型的变量，而不指定数据的
值：
Vertex thisVertex;
在这种情况下，所有数据成员都是默认初始化的。在这种情况下，
数据成员都是浮点数，因此它们根本没有初始化，并且
包含发生在这些内存位置的任何位模式。 />
如果你根本没有定义构造函数，编译器会自动为你生成这样一个
的默认构造函数。但是，如果您定义了自己的任何
构造函数（如此处所示），则必须定义
默认构造函数（如果需要）。 />
-
Jon Bell< jt ******* @ presby.edu> Presbyterian College
美国南卡罗来纳州克林顿物理与计算机科学系
Vertex（）{}是默认构造函数。每次声明没有默认参数的物体时，都会调用它。
例如，
Vertex v1; \\ Vertex（）被称为
Vertex v2（0,0,0,0,0,0,0,0）; \\第二个Vertex构造函数被调用。
丹佛。
" Dave" < da ********************************** @ hotmail.co m>在留言中写道
新闻：3f ****** @ dnews.tpgi.com.au ...有人请你这么好解释：
struct Vertex
{Vertex（）{}
Vertex（float x，float y，float z，
float nx，float ny，float nz，float u，漂浮v）
{
_x = x; _y = y; _z = z;
_nx = nx; _ny = ny; _nz = nz;
_u = u; _v = v;
}
浮_x，_y，_z，_nx，_ny，_nz，_u，_v;
静态const DWORD FVF;
Vertex（）{}
Vertex（float x，float y，float z ，
浮动nx，浮动ny，浮动nz，浮动u，浮动v）
{
_x = x; _y = y; _z = z;
_nx = nx; _ny = ny; _nz = nz;
_u = u; _v = v;
}
是一个函数？vertex（）{}一个变量。有人至少可以给我一个
的名字，告诉我这里发生了什么，所以我知道该找什么？
欢呼
dave
would someone please be so kind as to explain:
would someone please be so kind as to explain:
struct Vertex
{
Vertex(){}
Vertex(float x, float y, float z,
float nx, float ny, float nz, float u, float v)
{
_x = x; _y = y; _z = z;
_nx = nx; _ny = ny; _nz = nz;
_u = u; _v = v;
}
float _x, _y, _z, _nx, _ny, _nz, _u, _v;
static const DWORD FVF;
};
what on earth is this:?!?!?!
Vertex(){}
Vertex(float x, float y, float z,
float nx, float ny, float nz, float u, float v)
{
_x = x; _y = y; _z = z;
_nx = nx; _ny = ny; _nz = nz;
_u = u; _v = v;
}
is vertex(){} a function? a variable. Could someone at least give me a name
as to what''s going on here so i know what to look for?
cheers
dave
In article <3f******@dnews.tpgi.com.au>,
Dave <da**********************************@hotmail.co m> wrote:would someone please be so kind as to explain:
struct Vertex
{
Vertex(){}
Vertex(float x, float y, float z,
float nx, float ny, float nz, float u, float v)
{
_x = x; _y = y; _z = z;
_nx = nx; _ny = ny; _nz = nz;
_u = u; _v = v;
}
float _x, _y, _z, _nx, _ny, _nz, _u, _v;
static const DWORD FVF;
}; [snip]is vertex(){} a function?
It''s a constructor that takes no arguments/parameters, and does nothing.
It allows you to declare a variable of type Vertex without specifying
values for the data:
Vertex thisVertex;
in which case all the data members are default-initialized. In this case,
the data members are all floats, so they are not initialized at all and
contain whatever bit-patterns happened to be in those memory locations.
If you define no constructors at all, the compiler generates such a
default constructor for you automatically. However, if you define any
constructors of your own (as is the case here), you must define the
default constructor, too, if you want one.
--
Jon Bell <jt*******@presby.edu> Presbyterian College
Dept. of Physics and Computer Science Clinton, South Carolina USA
Vertex(){} is the default constructor. It is called every time an object of
Vertex is declared with no default parameters.
e.g.,
Vertex v1; \\ Vertex() is called
Vertex v2(0,0,0,0,0,0,0,0); \\ the second Vertex constructor is called.
Denver.
"Dave" <da**********************************@hotmail.co m> wrote in message
news:3f******@dnews.tpgi.com.au...would someone please be so kind as to explain:
struct Vertex
{
Vertex(){}
Vertex(float x, float y, float z,
float nx, float ny, float nz, float u, float v)
{
_x = x; _y = y; _z = z;
_nx = nx; _ny = ny; _nz = nz;
_u = u; _v = v;
}
float _x, _y, _z, _nx, _ny, _nz, _u, _v;
static const DWORD FVF;
};
what on earth is this:?!?!?!
Vertex(){}
Vertex(float x, float y, float z,
float nx, float ny, float nz, float u, float v)
{
_x = x; _y = y; _z = z;
_nx = nx; _ny = ny; _nz = nz;
_u = u; _v = v;
}
is vertex(){} a function? a variable. Could someone at least give me a name as to what''s going on here so i know what to look for?
cheers
dave
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