Once you have cloned the repo, you have everything: you can then `hg up branchname` or `hg up tagname` to update your working copy.

UP: `hg up` is a shortcut of `hg update`, which also has `hg checkout` alias for people with `git` habits.

When I try to use `float` as a template parameter, the compiler cries for this code, while `int` works fine.

Is it because I cannot use `float` as a template parameter?

    #include&lt;iostream&gt;
    using namespace std;
    
    template &lt;class T, T defaultValue&gt;
    class GenericClass
    {
    private:
        T value;
    public:
        GenericClass()
        {
            value = defaultValue;
        }
    
        T returnVal()
        {
            return value;
        }
    }; 
        
            
    int main()
    {
        GenericClass &lt;int, 10&gt; gcInteger;
        GenericClass &lt; float, 4.6f&gt; gcFlaot;
        
        cout &lt;&lt; &quot;\n sum of integer is &quot;&lt;&lt;gcInteger.returnVal();
        cout &lt;&lt; &quot;\n sum of float is &quot;&lt;&lt;gcFlaot.returnVal();
    
        return 0;       
    }

**Error:**

&lt;!-- language: lang-none --&gt;

    main.cpp: In function `int main()&#39;:
    main.cpp:25: error: `float&#39; is not a valid type for a template constant parameter
    main.cpp:25: error: invalid type in declaration before &#39;;&#39; token
    
    main.cpp:28: error: request for member `returnVal&#39; in `gcFlaot&#39;,
                        which is of non-class type `int&#39;

I am reading *&quot;Data Structures for Game Programmers&quot;* by Ron Penton, the author passes a `float`, but when I try it it doesn&#39;t seem to compile.


Why can&#39;t I use float value as a template parameter?

&gt; **Possible Duplicate:**  
&gt; [Java: Rationale of the Object class not being declared abstract](https://stackoverflow.com/questions/710362/java-rationale-of-the-object-class-not-being-declared-abstract)  

&lt;!-- End of automatically inserted text --&gt;

Why is the Object class, which is base class of &#39;em all in Java, not abstract?

I&#39;ve had this question for a really really long time and it is asked here purely out of curiosity, that&#39;s all. Nothing in my code or anybody&#39;s code is breaking because it is not abstract, but I was wondering why they made it concrete?

Why would anyone want an &quot;instance&quot; (and not its presence a.k.a. Reference) of this Object class? One case is a poor synchronization code which uses the instance of an Object for locking (at least I used it this way once.. my bad).

Is there any practical use of an &quot;instance&quot; of an Object class? And how does its instantiation fit in OOP? What would have happened if they had marked it abstract (of course after providing implementations to its methods)?

Why java.lang.Object is not abstract?

I followed the documentation in https://developer.mozilla.org/En/Developer_Guide/Source_Code/Mercurial
and downloaded FF source with:

    hg clone http://hg.mozilla.org/mozilla-central/ src

How can I switch to the FF3.6 &#39;branch&#39; or &#39;tag&#39;? The documentation said

    hg clone http://hg.mozilla.org/releases/mozilla-1.9.2/ 192src

but I don&#39;t want to clone both FF main and FF3.6 twice?


How can I switch to a tag/branch in hg?

I followed the documentation in <a href="https://developer.mozilla.org/En/Developer_Guide/Source_Code/Mercurial" target="_blank" rel="noopener noreferrer">https://developer.mozilla.org/En/Developer_Guide/Source_Code/Mercurial</a>
and downloaded FF source with:
<pre><code class="hljs language-bash">hg clone http://hg.mozilla.org/mozilla-central/ src
</code></pre>
How can I switch to the FF3.6 'branch' or 'tag'? The documentation said
<pre><code class="hljs language-bash">hg clone http://hg.mozilla.org/releases/mozilla-1.9.2/ 192src
</code></pre>
but I don't want to clone both FF main and FF3.6 twice?

Accidentally, by using a GUI as opposed to CLI, I removed every file in a Mercurial project.

I recovered with Revert ok and lost some work, which as I have time machine I could easily get back. But is there a way of un-remove/undelete such files? Trawled through the manual and googled but cannot see anything. Any plugins?

I am probably answering my own question here but the files were gone from the directory and were not in the trash to recover so I am assuming Remove is irrevocable?

p.s. I know that `hg forget` or `hg remove -Af` will remove without deleting from the directory but my question has to do with the error I made as opposed to cool thinking the action through.

How can I recover a removed file in Mercurial (if at all)?

I want to move a changeset from one branch to another. Basically, I currently have:

    A -&gt; B -&gt; C -&gt; D # default branch

And I want:

    A # default branch
     \-&gt; B -&gt; C -&gt; D # some_new_branch

Where some_new_branch does not exist yet. I am used to git, so I guess there is a simple &quot;mercurial&quot; way I am missing.

How to move some changeset to a new branch in mercurial

How do I find out who is responsible for a specific line of code? I know the linenumber and the filename but I would like Mercurial to tell me the author(s) of that specific line of code. Is there a command for that?

Finding the author of a line of code in Mercurial

I&#39;ve finished working on a feature branch `feature-x`. I want to merge results back to the `default` branch and close `feature-x` in order to get rid of it in the output of `hg branches`.

I came up with the following scenario, but it has some issues:

    $ hg up default
    $ hg merge feature-x
    $ hg ci -m merge
    $ hg up feature-x
    $ hg ci -m &#39;Closed branch feature-x&#39; --close-branch

So the `feature-x` branch (changests `40`-`41`) is closed, but there is *one new head*, the closing branch changeset `44`, that will be listed in `hg heads` every time:

    $ hg log ...
    o  44 Closed branch feature-x
    |
    | @  43 merge
    |/|
    | o  42 Changeset C
    | |
    o |  41 Changeset 2
    | |
    o |  40 Changeset 1
    |/
    o  39 Changeset B
    |
    o  38 Changeset A
    |

**Update**: It appears that since version 1.5 Mercurial doesn&#39;t show heads of closed branches in the output of `hg heads` anymore.

Is it possible to close a merged branch without leaving one more head? Is there more correct way to close a feature branch?

Related questions:

* [Is there a downside to this Mercurial workflow: named branch &quot;dead&quot; head?][1]

  [1]: https://stackoverflow.com/questions/3638987/is-there-a-downside-to-this-mercurial-workflow-named-branch-dead-head


How to correctly close a feature branch in Mercurial?

I&#39;m using Mercurial. I made a clone of a repository. For debugging, I changed a few lines of code in a java file. I did not commit those changes though. I just want to revert them back to their original state, as found in the repository. I tried `hg revert filename.java`, which did revert it, but now when I do `hg status`, I see additional files added in my folder now like:

    ? filename.java.orig

Can I just delete those files, and why does Mercurial make them when I use revert?

Content Type	Original Author	Original Content on Stackoverflow
Question	n179911	View Question on Stackoverflow
Solution 1 - Mercurial	crazyscot	View Answer on Stackoverflow

How can I switch to a tag/branch in hg?

Mercurial Problem Overview

Mercurial Solutions

Solution 1 - Mercurial

Why java.lang.Object is not abstract?

Why can't I use float value as a template parameter?

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