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

#include "getItem.h"

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

// 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"/>
        <linecontainsregexp negate="true">
            <regexp pattern="&lt;\?xml version"/>
<property name="first" value="true"/>

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

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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