漏点异常的等级是什么？ [英] What is the class of a loating point exception ?
问题描述
在Stroustrup中，他谈到了一个MathErr类，你可以用来捕获
浮点异常。
它不存在，至少在Visual C ++中不存在
我可以使用catch（...）来捕获FP异常，但是我很难找到我正在捕捉的类是什么的b $ b。 />
我想知道如何以比
catch（...）更优雅的方式捕获它们，然后在寄存器中调整以猜测问题。
TIA
EoG
In Stroustrup he talks of a MathErr class that you can use to catch
floating point exceptions.
It doesn''t exist, at least not in Visual C++
I can catch FP exceptions using catch(...) but am stumped in finding
out what the class I''m catching is.
I would like to know how to catch them in a more elegant way than
catch(...) and then poling around in registers to guess the problem.
TIA
EoG
推荐答案
2007-03-18 14 ：26， Ev********@googlemail.com 写道：
On 2007-03-18 14:26, Ev********@googlemail.com wrote:
在Stroustrup中，他谈到了一个MathErr类，你可以用它来捕获
浮点异常。
它不存在，至少不是在Visual C ++中
我可以使用catch（...）来捕获FP异常但是我很难找到
out the clas我很抓人了。
我想知道如何以比
catch（...）更优雅的方式捕获它们然后在注册以猜测问题。
In Stroustrup he talks of a MathErr class that you can use to catch
floating point exceptions.
It doesn''t exist, at least not in Visual C++
I can catch FP exceptions using catch(...) but am stumped in finding
out what the class I''m catching is.
I would like to know how to catch them in a more elegant way than
catch(...) and then poling around in registers to guess the problem.
一般来说，浮点错误不会在C ++中抛出异常，例如
double i = 0;
double j = 1 / i;
不会抛出异常（但会终止你的应用）。如果你想要在C ++中处理浮点错误，你必须自己检查它们并抛出一个适当的异常。这样做的一种方法是
将float / double封装在一个类中，其接口与dloat /
double相同但执行这些检查。
-
Erik Wikstr？m
In general floating point errors do not throw exceptions in C++, for example
double i = 0;
double j = 1/i;
will not throw an exception (it will however terminate your app). If you
want to handle floating point errors in C++ you have to check for them
yourself and throw an appropriate exception. One way tho do this is to
encapsulate float/double in a class with the same interface as dloat/
double but which performs those checks.
--
Erik Wikstr?m
3月18日下午3:24，Erik Wikstr？m< Erik-wikst ... @ telia.comwrote：
On Mar 18, 3:24 pm, Erik Wikstr?m <Erik-wikst...@telia.comwrote:
一般来说，浮点错误不会在C ++中抛出异常，例如
double i = 0;
double j = 1 / i;
不会抛出异常（但会终止你的应用）。
In general floating point errors do not throw exceptions in C++, for example
double i = 0;
double j = 1/i;
will not throw an exception (it will however terminate your app).
这不是未定义的行为吗？在我的gcc上它只会导致
NaN在cout-ed时打印#INF。
Isn''t it undefined behaviour? On my gcc it does only result in having
NaN that prints #INF when cout-ed.
3月18日， 14：24，Erik Wikstr？m< Erik-wikst ... @ telia.comwrote：
On 18 Mar, 14:24, Erik Wikstr?m <Erik-wikst...@telia.comwrote:
2007-03-18 14:26，EvilOld .. 。@ googlemail.com写道：
On 2007-03-18 14:26, EvilOld...@googlemail.com wrote:
在Stroustrup中，他谈到了一个MathErr类，你可以使用它来捕获
浮点异常。 br />
它不存在，至少不存在于Visual C ++
In Stroustrup he talks of a MathErr class that you can use to catch
floating point exceptions.
It doesn''t exist, at least not in Visual C++
我可以使用catch捕获FP异常（.. 。）但我很难找到我正在捕捉的课程。
我想知道如何以比<更优雅的方式捕捉它们br />
catch（...）然后在寄存器中进行极化以猜测问题。
I can catch FP exceptions using catch(...) but am stumped in finding
out what the class I''m catching is.
I would like to know how to catch them in a more elegant way than
catch(...) and then poling around in registers to guess the problem.
一般来说，浮点错误不会在C ++中抛出异常，例如
double i = 0;
double j = 1 / i;
不会抛出异常（但会终止你的应用）。如果你想要在C ++中处理浮点错误，你必须自己检查它们并抛出一个适当的异常。这样做的一种方法是
将float / double封装在一个类中，其接口与dloat /
double相同但执行这些检查。
-
Erik Wikstr？m
In general floating point errors do not throw exceptions in C++, for example
double i = 0;
double j = 1/i;
will not throw an exception (it will however terminate your app). If you
want to handle floating point errors in C++ you have to check for them
yourself and throw an appropriate exception. One way tho do this is to
encapsulate float/double in a class with the same interface as dloat/
double but which performs those checks.
--
Erik Wikstr?m
我正在使用VC ++，如果你设置了标志，它将在div / 0等上抛出一个异常
。
我总是按照Erik的建议做的，使用test&扔了，但是很长时间
觉得我可以做得更好。
我*差不多了。
VC ++会抛出一个合适的C ++风格例外（不是Win32 SEH）
但是我没有抓住它。
如果我能确定异常的类型，我可以深入了解
更好。
我的目标是构建一个框架特别防弹的FP代码，
，它允许你以一定的精度搜寻错误。
我在那里，但已撞墙了。
I''m using VC++, and if you set the flags, it will throw an exception
on div/0 et al.
I''ve always done what Erik suggests, using test & throw, but have long
felt I could do a lot better.
I *nearly* have.
VC++ will throw a proper C++ style exception (not a Win32 SEH one)
But I ca''nt catch it.
If I could determine the type of exception I could then drill down
better.
My goal is to build a framework exceptionally bullet proof FP code,
that allows you to hunt down bugs with some precision.
I''m part way there, but have hit a wall.
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