Re: [Video] Game development in Clojure (with play-clj)

[Zach Oakes]

That function was renamed to `key-pressed?`.

On Saturday, October 17, 2015 at 7:32:44 PM UTC-4, amirteymuri wrote:
>
> Dear James,
> is-pressed? can not be resolved for me. Is this a version matter? Is there 
> still a is-pressed? function?
> Greetings
>
> Am Donnerstag, 27. März 2014 18:07:21 UTC+1 schrieb James Trunk:
>>
>> Hi everyone,
>>
>> I thought some of you might be interested to watch my screencast about game 
>> development in Clojure with play-clj 
>> .
>>
>> Cheers,
>> James
>>
>

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ClojureCLR setup guide/examples?

[Rui Carmo]

Hello guys,

I'm re-investing in the .NET ecosystem, and decided to try my hand at 
adding ClojureCLR to the mix given my very positive experience with the JVM 
version.

However, I'm having trouble with two basic things:

- I can't find a comprehensive guide regarding setting up a working 
ClojureCLR environment under Windows (8 or 10), so it took me three tries 
to get a moderately usable REPL
- the vsClojure extension doesn't support Visual Studio 2015 (I've found a 
fork that seems to have been updated, but haven't managed to rebuild it yet)

That and the lack of documentation regarding deployments (is there a 
recommended way to deploy a web service written in ClojureCLR? examples of 
working with a database?) have prevented me from making any significant 
headway, so I'd appreciate any pointers, especially from people who are 
currently using ClojureCLR successfully.

(and I apologise for saying this, but I don't want to use the JVM version 
under Windows - I'm perfectly happy with using it on Linux, including ARM 
servers, but the purpose of this exercise is to glue together existing C# 
assemblies).

Regards,

R.

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lazyseq?

[Brian Marick]

Is there a way to tell if `v` is a lazyseq other than `(instance? 
clojure.lang.LazySeq v)`? Seems like there should be, but I'm not seeing it.


[Preparing to say "duh!"]

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Re: lazyseq?

[Timothy Baldridge]

Often if you want to know if something is a lazy seq, you really want to
know if it is a delayed computation. If that's the case, realized? may
help.

But I also wonder what you are trying to accomplish. There are many seqs in
Clojure that are not lazy, and so could have interesting results if you
expect a seq to be a lazy seq. Also, there are some really weird rules
around chunked seqs, lazy seqs, and cons cells. Overall testing for a
LazySeq is probably more trouble than it's worth.

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Calling object members with symbols

[Timur]

Hi all,

Is there anyway to call an object member using its symbol? 

For instance we have an object o, we get the symbol of a method, e.g., 
toString, of our object o using clojure.reflect/reflect and and I want to 
execute this method on this object through the symbol. 

For instance *(. obj sym)* throws an exception. Here symbol for instance 
contains toString

Any ideas about how I can do this? 

Regards,

Timur

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Re: Calling object members with symbols

[dennis zhuang]

You may have to use macro:

user=> (defmacro invoke [obj sym] `(. ~obj ~sym))
#'user/invoke
user=> (invoke 1 toString)
"1"

2015-10-19 6:54 GMT+08:00 Timur :

> Hi all,
>
> Is there anyway to call an object member using its symbol?
>
> For instance we have an object o, we get the symbol of a method, e.g.,
> toString, of our object o using clojure.reflect/reflect and and I want to
> execute this method on this object through the symbol.
>
> For instance *(. obj sym)* throws an exception. Here symbol for instance
> contains toString
>
> Any ideas about how I can do this?
>
> Regards,
>
> Timur
>
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-- 
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Re: Calling object members with symbols

[Michael Blume]

Nope, still won't work.

(let [s 'toString] (invoke 1 s))

java.lang.IllegalArgumentException: No matching field found: s for class
java.lang.Long



On Sun, Oct 18, 2015 at 5:51 PM dennis zhuang  wrote:

> You may have to use macro:
>
> user=> (defmacro invoke [obj sym] `(. ~obj ~sym))
> #'user/invoke
> user=> (invoke 1 toString)
> "1"
>
> 2015-10-19 6:54 GMT+08:00 Timur :
>
>> Hi all,
>>
>> Is there anyway to call an object member using its symbol?
>>
>> For instance we have an object o, we get the symbol of a method, e.g.,
>> toString, of our object o using clojure.reflect/reflect and and I want to
>> execute this method on this object through the symbol.
>>
>> For instance *(. obj sym)* throws an exception. Here symbol for instance
>> contains toString
>>
>> Any ideas about how I can do this?
>>
>> Regards,
>>
>> Timur
>>
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>
>
>
> --
> 庄晓丹
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> Site:   http://fnil.net
> Twitter:  @killme2008
>
>
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Re: Calling object members with symbols

[James Reeves]

On 18 October 2015 at 23:54, Timur  wrote:

> Hi all,
>
> Is there anyway to call an object member using its symbol?
>
> For instance we have an object o, we get the symbol of a method, e.g.,
> toString, of our object o using clojure.reflect/reflect and and I want to
> execute this method on this object through the symbol.
>
> For instance *(. obj sym)* throws an exception. Here symbol for instance
> contains toString
>
> Any ideas about how I can do this?
>

eval is probably the most straightforward way to achieve this:

(eval `(. ~obj ~sym))

I'm uncertain of the performance of this compared to using the Java
reflection API, but it's a lot easier to write.

- James

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Re: Calling object members with symbols

[dennis zhuang]

In such case you have to use `eval`, another post

https://groups.google.com/forum/#!topic/clojure/YJNRnGXLr2I

2015-10-19 9:10 GMT+08:00 James Reeves :

> On 18 October 2015 at 23:54, Timur  wrote:
>
>> Hi all,
>>
>> Is there anyway to call an object member using its symbol?
>>
>> For instance we have an object o, we get the symbol of a method, e.g.,
>> toString, of our object o using clojure.reflect/reflect and and I want to
>> execute this method on this object through the symbol.
>>
>> For instance *(. obj sym)* throws an exception. Here symbol for instance
>> contains toString
>>
>> Any ideas about how I can do this?
>>
>
> eval is probably the most straightforward way to achieve this:
>
> (eval `(. ~obj ~sym))
>
> I'm uncertain of the performance of this compared to using the Java
> reflection API, but it's a lot easier to write.
>
> - James
>
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