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How to avoid littering header files with std::


How to avoid littering header files with std::

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How to avoid littering header files with std::
Tag : cpp , By : msugar
Date : December 01 2020, 05:00 PM

may help you . There's nothing wrong using std::. In fact, I find my self reading code written by other people and when I see something like stack stk;, it makes me wonder if that stack is standard. Thus, I would recommend using it, as although you type 5 more characters, it makes your code more readable to other coders.
Now as far as why what you've tried doesn't work. It doesn't because C++ doesn't allow it. According to the draft standard 7.3.4/p1 Using directive [namespace.udir] (Emphasis Mine):
class Foo {
  using namespace std;
};
class Foo {
  using std::vector;
};
class Foo {
  using std::vector<int>;
};
namespace mine {
  using namespace std;

  struct foo {
    unique_ptr<int> ptr;
  };
}
struct Foo {
  template<typename T>
  using unique_ptr = std::unique_ptr<T>;
  unique_ptr<int> ptr;
};

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How to avoid typedef redundancy in two different header files?


Tag : cpp , By : changke
Date : March 29 2020, 07:55 AM
To fix this issue The easiest way to avoid conflicting names is by creating namespaces within the scope of the header page. Here is an example of a grocery store database I had to create for a final.
// File: store.h // stores the items bought
#ifndef STOREITEM_H
#define STOREITEM_H

#include "getItem.h"

namespace groceryStore
{
class StoreItem
{
    public:
        StoreItem();
        StoreItem(Buying product, int quantity);
        Buying getId() const;
        int getQuantity() const;
        double getTotal() const;
        void increaseQuantity();
        bool operator == (StoreItem & o);
    private:
        int quantity;
        Buying product;
    };
}

#endif
// PRE: Must be called
// POST: Will return the id
groceryStore::Buying groceryStore::StoreItem::getId() const
{
    return product; // change to id
}

How to avoid recompiling header files


Tag : cpp , By : Neuromaster
Date : March 29 2020, 07:55 AM
will help you Precompiled headers:
What you are doing does sound like it would benefit heavily from precompiled headers (pch's). The intel compiler does support pch's, as you can see here:
export PATH=$PATH:the-path-to-your-compiled-executables.

How to avoid xml header while concatenating xml files in ant script


Tag : java , By : Franky
Date : March 29 2020, 07:55 AM
This might help you I am concatenating all the xml files in a folder into a single xml file in ant script. While concatenating the xml files, the header , You can apply a regex to discard the header:
<concat destfile="${docbook.dir}/all-sections.xml" force="no">       
    <fileset dir="${docbook.dir}" includes="sections/*.xml"/>
    <filterchain>
        <linecontainsregexp negate="true">
            <regexp pattern="&lt;\?xml version"/>
        </linecontainsregexp>
    </filterchain>  
 </concat>
<property name="first" value="true"/>

<concat destfile="${docbook.dir}/all-sections.xml">       
    <fileset dir="${docbook.dir}" includes="sections/*.xml"/>
    <filterchain>
        <scriptfilter language="javascript">
        <![CDATA[
            first = project.getProperty("first");
            if(self.getToken().indexOf("<\?xml version") != -1) {
                if(first == "true") {
                    project.setProperty("first", "false");
                } else {
                    self.setToken(null);
                }
            }
        ]]> 
        </scriptfilter>             
    </filterchain>
</concat>

CMake: Avoid Header Files and Source Files Visual Studio filters and put cpp and h files on the solution root


Tag : cmake , By : Jack
Date : March 29 2020, 07:55 AM

How to avoid stdafx and other header files


Tag : cpp , By : user137798
Date : March 29 2020, 07:55 AM
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