< fstream.h> ，不需要< iostream.h>？ [英] <fstream.h> , no need for <iostream.h>?
问题描述
我已经读过包含< fstream.h>包含
< iostream.h>不必要的。
这是正确的吗？
Charles L
" Charles L" < TJ *** @ dodo.com.au>在消息中写道
新闻：40 ****** @ news.comindico.com.au ...我已经读过包含< fstream。 h取代;包含
< iostream.h>这是正确的吗？
首先，不要使用< fstream.h>和< iostream.h>。使用< fstream>和
< iostream>相反。
至于你的问题：我不知道这种行为是否是标准的定义，
但至少在我的系统上（VC7.1） ）包括< fstream>没有包含< iostream>的
不必要。所以答案是肯定的。
-
不可原谅
Unforgiven写道：" Charles L" < TJ *** @ dodo.com.au>在消息中写道
新闻：40 ****** @ news.comindico.com.au ...
我已经读过包含< fstream。 h取代;包含
< iostream.h>这是正确的吗？
首先，不要使用< fstream.h>和< iostream.h>。使用< fstream>和
< iostream>对于你的问题：我不知道这个行为是否是标准的定义，但至少在我的系统上（VC7.1），包括< fstream>没有包含< iostream>不必要。所以答案是否定的。
标准要求在不同的
标题中声明不同的部分。要使用某个元素（类，模板，对象），需要
来包含相应的标题。实际上，这应该是一个简单的规则。
。你需要''cout''或'cerr''？使用< iostream>。你需要'b $ b'需要''字符串''？使用< string>。您需要''排序''，使用< algorithm>。等等。
一个人不应该关心自己（无论是平台或编译器 -
依赖）标准标题之间的交叉引用，即使有
a其中一些之间的逻辑连接可能暗示这样的交叉引用（或将一个包含在另一个中）。
Victor
在文章< 2k ************ @ uni-berlin.de>中，Unforgiven写道：Charles L < TJ *** @ dodo.com.au>在消息中写道
新闻：40 ****** @ news.comindico.com.au ...我已经读过包含< fstream.h>包含
< iostream.h>这是不正确的？
首先，不要使用< fstream.h>和< iostream.h>。使用< fstream>和
< iostream>对于你的问题：我不知道这种行为是否是标准定义的，
但至少在我的系统上（VC7.1）包括< fstream>没有包含< iostream>不必要。所以答案是否定的。
我正在上C ++课，他们使用< iostream>而不是
< iostream.h>在示例中。
使用其中一个的原因是什么。我知道如果
你使用.h你不必使用''使用std :: xxxxxx''语句。
I have read that the inclusion of <fstream.h> makes the inclusion of
<iostream.h> unnecessary.
Is this correct?
Charles L解决方案"Charles L" <tj***@dodo.com.au> wrote in message
news:40******@news.comindico.com.au...I have read that the inclusion of <fstream.h> makes the inclusion of
<iostream.h> unnecessary.
Is this correct?
First of all, don''t use <fstream.h> and <iostream.h>. Use <fstream> and
<iostream> instead.
As for your question: I don''t know if that behaviour is standard defined,
but on my system at least (VC7.1) including <fstream> does not make
inclusion of <iostream> unnecessary. So the answer is no.
--
Unforgiven
Unforgiven wrote:"Charles L" <tj***@dodo.com.au> wrote in message
news:40******@news.comindico.com.au...I have read that the inclusion of <fstream.h> makes the inclusion of
<iostream.h> unnecessary.
Is this correct?
First of all, don''t use <fstream.h> and <iostream.h>. Use <fstream> and
<iostream> instead.
As for your question: I don''t know if that behaviour is standard
defined, but on my system at least (VC7.1) including <fstream> does not
make inclusion of <iostream> unnecessary. So the answer is no.
The Standard mandates that different pieces are declared in different
headers. To use a certain element (class, template, object) one need
to include the corresponding header. It should be a simple rule to
follow, actually. You need ''cout'' or ''cerr''? Use <iostream>. You
need ''string''? Use <string>. You need ''sort'', use <algorithm>. Etc.
One should never concern oneself with (whether platform- or compiler-
dependent) cross-references between standard headers, even if there is
a logical connection between some of them which might suggest such
cross-reference (or inclusion of one into the other).
Victor
In article <2k************@uni-berlin.de>, Unforgiven wrote:"Charles L" <tj***@dodo.com.au> wrote in message
news:40******@news.comindico.com.au...I have read that the inclusion of <fstream.h> makes the inclusion of
<iostream.h> unnecessary.
Is this correct?
First of all, don''t use <fstream.h> and <iostream.h>. Use <fstream> and
<iostream> instead.
As for your question: I don''t know if that behaviour is standard defined,
but on my system at least (VC7.1) including <fstream> does not make
inclusion of <iostream> unnecessary. So the answer is no.
I''m taking a class in C++ and they use <iostream> rather than
<iostream.h> in the examples.
What is the reason for using one over the other. I know that if
you use the .h you don''t have to use ''using std::xxxxxx'' statements.
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