Would people agree with the statement that to a large degree, using template
metaprogramming techniques turns a C++ compiler into a C++ interpreter (but
just for the metaprogrammed portions of the code)? It's not a perfect
analogy, but it seems to be a reasonable statement...
12  2161 
"Dave" <be***********@ yahoo.com> wrote... Would people agree with the statement that to a large degree, using
template metaprogramming techniques turns a C++ compiler into a C++ interpreter
(but just for the metaprogrammed portions of the code)? It's not a perfect
analogy, but it seems to be a reasonable statement...
Every compiler is an interpreter if it can handle things like
int a = 1 + 2 + 3 + 4;
by creating a definition of 'a' initialised to 10 instead of
a special piece of code that performs three additions with the
immediate operands.
Victor
"Dave" <be***********@ yahoo.com> wrote in message news:vu******** ****@news.super news.com... Would people agree with the statement that to a large degree, using template
metaprogramming techniques turns a C++ compiler into a C++ interpreter (but
just for the metaprogrammed portions of the code)? It's not a perfect
analogy, but it seems to be a reasonable statement...
I wouldn't agree with the statement. It's more of a supercompiler as it
can precompute code at compile time as opposed to translating language
at run time.
"Victor Bazarov" <v.********@com Acast.net> wrote in message news:u8%Fb.1190 86$8y1.371001@a ttbi_s52... Every compiler is an interpreter if it can handle things like
int a = 1 + 2 + 3 + 4;
by creating a definition of 'a' initialised to 10 instead of
a special piece of code that performs three additions with the
immediate operands.
Every compiler has to be able to handle that. 1 + 2 + 3 + 4
is a constant expression.
The fact that a compiler can precompute things at compile
time makes it LESS of an interpreter than more of one in my
opinion.
Ron Natalie wrote: "Dave" <be***********@ yahoo.com> wrote in message news:vu******** ****@news.super news.com...
Would people agree with the statement that to a large degree, using template
metaprogrammi ng techniques turns a C++ compiler into a C++ interpreter (but
just for the metaprogrammed portions of the code)? It's not a perfect
analogy, but it seems to be a reasonable statement...
I do see what you mean. You're getting the compiler to execute a
program for you, in much the same way that a Unix shell executes your
commands. However, the compiler is acting as a very special-purpose
interpreter, useful only for generating "traditiona l" code. The reason
is that run-time libraries, system interfaces, etc. are not available.
Ron Natalie wrote:
I wouldn't agree with the statement. It's more of a supercompiler as it
can precompute code at compile time as opposed to translating language
at run time.
I have to agree with Ron. The compiler is acting more like a CASE tool
than a traditional compiler. Speaking of which, whatever happened to
4GL's? Does C++ metaprogramming count?
-Jeff
"Jeff Schwab" <je******@comca st.net> wrote in message
news:G7******** ************@co mcast.com... Ron Natalie wrote: "Dave" <be***********@ yahoo.com> wrote in message
news:vu******** ****@news.super news.com...Would people agree with the statement that to a large degree, using
templatemetaprogrammi ng techniques turns a C++ compiler into a C++ interpreter
(butjust for the metaprogrammed portions of the code)? It's not a perfect
analogy, but it seems to be a reasonable statement...
I do see what you mean. You're getting the compiler to execute a
program for you, in much the same way that a Unix shell executes your
commands. However, the compiler is acting as a very special-purpose
interpreter, useful only for generating "traditiona l" code. The reason
is that run-time libraries, system interfaces, etc. are not available.
Yeah, this characterizatio n of template metaprogramming recently occurred to
me as I was trying my hand at a couple of miscellaneous problems just to see
if I could do it. I successfully implemented the compile-time calculation
of order statistics via template metaprogramming and it was at that point
the thought occurred to me that there is something sort of akin to
interpretation going on. Although, your point about the lack of
availability of any run-time libraries, etc... is well-taken!
Ron Natalie wrote:
I wouldn't agree with the statement. It's more of a supercompiler as
it can precompute code at compile time as opposed to translating language
at run time.
I have to agree with Ron. The compiler is acting more like a CASE tool
than a traditional compiler. Speaking of which, whatever happened to
4GL's? Does C++ metaprogramming count?
-Jeff
Dave wrote: "Jeff Schwab" <je******@comca st.net> wrote in message
news:G7******** ************@co mcast.com...
Ron Natalie wrote:
"Dave" <be***********@ yahoo.com> wrote in message just for the metaprogrammed portions of the code)? It's not a perfect
analogy, but it seems to be a reasonable statement...
I do see what you mean. You're getting the compiler to execute a
program for you, in much the same way that a Unix shell executes your
commands. However, the compiler is acting as a very special-purpose
interpreter , useful only for generating "traditiona l" code. The reason
is that run-time libraries, system interfaces, etc. are not available.
Yeah, this characterizatio n of template metaprogramming recently occurred to
me as I was trying my hand at a couple of miscellaneous problems just to see
if I could do it. I successfully implemented the compile-time calculation
of order statistics via template metaprogramming and it was at that point
the thought occurred to me that there is something sort of akin to
interpretation going on. Although, your point about the lack of
availability of any run-time libraries, etc... is well-taken!
So the question is - do you want metaprogramming in the regular language?
I've written a number of fancy templates and I find having to think in
this recursve "COME FROM" language a little bit of a challenge.
Then if you start to argue about this too much you'll have someone
remind you that lisp does all this in one language.
"Gianni Mariani" <gi*******@mari ani.ws> wrote in message
news:bs******** @dispatch.conce ntric.net... Dave wrote: "Jeff Schwab" <je******@comca st.net> wrote in message
news:G7******** ************@co mcast.com...
Ron Natalie wrote:
"Dave" <be***********@ yahoo.com> wrote in message>just for the metaprogrammed portions of the code)? It's not a perfect
>analogy, but it seems to be a reasonable statement...
I do see what you mean. You're getting the compiler to execute a
program for you, in much the same way that a Unix shell executes your
commands. However, the compiler is acting as a very special-purpose
interpreter , useful only for generating "traditiona l" code. The reason
is that run-time libraries, system interfaces, etc. are not available.
Yeah, this characterizatio n of template metaprogramming recently
occurred to me as I was trying my hand at a couple of miscellaneous problems just to
see if I could do it. I successfully implemented the compile-time
calculation of order statistics via template metaprogramming and it was at that
point the thought occurred to me that there is something sort of akin to
interpretation going on. Although, your point about the lack of
availability of any run-time libraries, etc... is well-taken!
So the question is - do you want metaprogramming in the regular language?
I've written a number of fancy templates and I find having to think in
this recursve "COME FROM" language a little bit of a challenge.
Then if you start to argue about this too much you'll have someone
remind you that lisp does all this in one language.
Yep, I agree with your sentiments! Not to mention that syntactically it's
awful. But that's not the fault of the language since templates weren't
envisioned to be used in this manner. Nonetheless, I find the concept of
compile-time programming (and especially that it is Turing-complete)
fascinating...
Gianni Mariani wrote: So the question is - do you want metaprogramming in the regular language?
I've written a number of fancy templates and I find having to think in
this recursve "COME FROM" language a little bit of a challenge.
Then if you start to argue about this too much you'll have someone
remind you that lisp does all this in one language.
So do a number of other interpreted languages, including Perl and Tcl.
I think that's why template-based metaprogramming reminded the OP of an
interpreted language.
"Dave" <be***********@ yahoo.com> wrote in message
news:vu******** ****@news.super news.com... Nonetheless, I find the concept of compile-time programming
(and especially that it is Turing-complete) fascinating...
Well I thought I followed alot of this thread, but what's 'Turing-complete'
?
Is there an incomplete?
--
Cheers
--
Hewson::Mike
"This letter is longer than usual because I lack the time to make it
shorter" - Blaise Pascal This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Dave |
last post by:
For those who might be so inclined, I was wondering if I might get honest
critiques of my first real venture into template metaprogramming. This
template metaprogram sorts a list of integers at compile time. It works,
but if my approach is more awkward or "bad" than need be, I'd love to hear
suggestions for improvement!
#include <iostream>
|
by: Mohammad |
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Hi,
Is it possible to disable a method of a template class depending on
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thanks!
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last post by:
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#include <iostream>
#include <cstdlib>
using namespace std;
template<int n>
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struct NullType {};
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last post by:
Hi,
I found a concept named template metaprogramming that can be used in C+
+ code at compile-time. I am a beginner at C++. But I am a programmer
on the .NET platform. Do you know if template metaprogramming is
supported in C# (.NET)? For reference I found it:
http://en.wikipedia.org/wiki/Template_metaprogramming.
Thanks to all.
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by: Ted |
last post by:
I have cross posted this to comp.lang.c++ and to sci.math.num-
analysis
in the belief that the topic is of interest to some in both groups.
I am building my toolkit, in support of my efforts in producing high
performance C++ code; code that is provably correct. The issue here
is orthogonal to the question of expression templates, which at
present seem to me to be relatively simple.
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Here are the command-lines I use to generate code:
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