N*********y
发帖数: 105 | 1 reinterpret_cast是強行翻譯，所以直接把pb指向的內存塊當成D*類型。reinterpret_
cast前后的內存起始地址一樣，所以pb和pb1指向同一位置。
static_cast靜態的嘗試做“合理”的翻譯。編譯器發現D是B的繼承類，并且D的起始地
址比B的起始地址相差A的大小，所以編譯器會把pb的起始地址減去A的大小來作為pd2的
地址。 |
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L*********r
发帖数: 92 | 2 it is the correct way to implement clone in java.
the logic is as following
1. object class will create the instance based on the run time class type
2. do memberwise copy
all the class along the hierarchy tree has to implement iclone and follow
same rule
the cast down is valid in this case |
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p*******n
发帖数: 273 | 3 不同的函数用不同的方法表示复数,
一个是
typedef double fft_complex[2];
一个是
typedef struct
{
double dat[2]
}gsl_complex
一个函数接口是gsl_complex, 想从fft_complex cast到gsl_complex, 直接用(gsl_
complex)a, 好像不行. 难道要定义一个新变量,重新赋值? |
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p*******n
发帖数: 273 | 4 用到的一些c库函数参量为double 指针,用得时候要把原始float数据转为double类型,
用完之后还要转回来. 直接cast float指针就出错.
不知道这样做的话,精度会损失多少.
这种情况有其他的好办法么?
多谢了 |
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l***g
发帖数: 1035 | 5 // is the following code compilable? is the cast operating on the value (tem
p) or the address?
int temp = 2;
...
foo((double)&temp); |
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k**f
发帖数: 372 | 6
tem
My understanding is that you are trying to cast an address to an integer to
a double, which is hardly correct.
If foo() expects an address to a double as its input, you need to declare an
intermediate variable, say x, of type double, initialized to the value of
temp, and then call foo() with the address of x: foo(&x). If foo modifies
its input, you can then assign x to temp (may loss fractional part, though). |
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S**I
发帖数: 15689 | 7 Compiler does not need to know: pB1's type is pointer to Base and Base is
not polymorphic (no virtual member function), dynamic cast is not allowed in
this case. Even if pB1 points to an object of class Derived, compiler will
still report error. |
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s****e
发帖数: 7018 | 8 【 以下文字转载自 Military 讨论区 】
发信人: svelte (svelte), 信区: Military
标 题: smart tv cast 怎么编程？
发信站: BBS 未名空间站 (Wed Feb 10 20:16:33 2016, 美东)
我想把各个视频网站上面的video投影到 smart tv 上面
有哪位知道如何下手么？ 多谢 |
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w******a
发帖数: 1527 | 9 我从来没有用过pre cast gel......
我们一般买Amersham Science的~~ |
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a**v
发帖数: 406 | 10 You can buy cast and spacers from Invitrogen and pour your own gel. |
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x*******6
发帖数: 994 | 11 本人是陶瓷方向，对有机不是很熟。现做 tape casting 项目。在这方面，我不是很熟
悉。有的文献说cyclohexanone 是Homogenizer。不知是什么原理？有的文献说
cyclohexanone 可以降低黏度。我想黏度应通过溶剂或binder 量来调节，不知对否？
如果可以通过溶剂或binder的量来调节黏度，为何需要cyclohexanone？多谢回复。 |
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w***8
发帖数: 465 | 12 spin coating是长膜的方法，在一些化学类杂志上会见到用spin-casting张纳米颗粒膜
，这两种是一个方法一个意思么？
3x |
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