• oliver (26/26) Nov 27 2007 Hi everyone,
• Steven Schveighoffer (5/9) Nov 27 2007 As far as I know, this is not possible. D does not currently support
• Robert Fraser (5/19) Nov 27 2007 Flectioned can do it:
• bearophile (4/6) Nov 28 2007 I know noting still about Flectioned, but maybe it can be used to create...
• oliver (33/33) Nov 29 2007 Thanks to everyone for looking into this. Here is how i have done it now...
• mandel (9/14) Nov 29 2007 As a side note.
• mandel (7/7) Nov 29 2007 ok, my previous was wrong.

oliver <oliver.ruebenkoenig web.de.REMOVE> writes:

Hi everyone,

is it possible to program kind of a general function that applies the name of a
function (given as a char [] ) to arguments. The following code does not work
but something in the same spirit.

Thanks once more to this very patient group.
Oliver

-------

import std.stdio;

int f1( int a ) { 
    return a+1;
}

int f2( int b ) { 
    return b-10;
}

int apply(char [] name, int arg) {
    return name(arg);
}

int main() {
    int i = 1;
    i = f1(i);
    writefln("i: ",i);
    i = f2(i);
    writefln("i: ",i);
    i = apply( "f1", i );
    i = apply( "f2", i );
    writefln("i: ",i);
    return 0;
}

"Steven Schveighoffer" <schveiguy yahoo.com> writes:

"oliver" wrote
 Hi everyone,

 is it possible to program kind of a general function that applies the name 
 of a function (given as a char [] ) to arguments. The following code does 
 not work but something in the same spirit.

As far as I know, this is not possible.  D does not currently support 
runtime reflection, which is required by this type of function.  Only 
compile-time reflection is possible.

-Steve 

Robert Fraser <fraserofthenight gmail.com> writes:

Steven Schveighoffer wrote:
 "oliver" wrote
 Hi everyone,

 is it possible to program kind of a general function that applies the name 
 of a function (given as a char [] ) to arguments. The following code does 
 not work but something in the same spirit.

 
 As far as I know, this is not possible.  D does not currently support 
 runtime reflection, which is required by this type of function.  Only 
 compile-time reflection is possible.
 
 -Steve 
 
 

Flectioned can do it:

http://flectioned.kuehne.cn/

of course, it's a hack/workaround rather than a language feature, but it 
works (on Win32 it only works if you compile with debug info).

bearophile <bearophileHUGS lycos.com> writes:

Robert Fraser:
 Flectioned can do it:
 http://flectioned.kuehne.cn/

I know noting still about Flectioned, but maybe it can be used to create
something similar to the Python doctest (you may not like it, but some people
love it)...
http://docs.python.org/lib/module-doctest.html

bearophile

oliver <oliver.ruebenkoenigREM web.de> writes:

Thanks to everyone for looking into this. Here is how i have done it now.
Oliver

-------------------------------

import std.stdio;

int f1( int a ) { 
    return a+1;
}

int f2( int b ) { 
    return b-10;
}

void insertInTable( char [] name, int function(int) address, inout int
function(int) [ char[] ] table) {
    table[ name ] = address;
}

int function(int) readFromTable( char [] name, int function(int) [ char [] ]
table ) { 
    if( name in table )
        return table[ name ];

    writefln("Name: ", name ," is not in table."); 
    //fix: some default.
}

int main() {
    int function(int) [ char [] ] funcAddressTable;
    insertInTable("f1", &f1, funcAddressTable);
    insertInTable("f2", &f2, funcAddressTable);

    int i = 1;
    i = f1(i);
    writefln("i: ", i); 
    i = f2(i);
    writefln("i: ", i); 

    auto myF = readFromTable("f2", funcAddressTable);
    i = myF(i);
    writefln("i: ", i); 

    return 0;
}

mandel <oh no.es> writes:

oliver Wrote:

 void insertInTable( char [] name, int function(int) address, inout int
function(int) [ char[] ] table) {
     table[ name ] = address;
 }

[..]
     insertInTable("f1", &f1, funcAddressTable);
     insertInTable("f2", &f2, funcAddressTable);

As a side note.
You can also write:
void insertInTable(inout int function(int) [ char[] ] table, char [] name, int
function(int) address) {
     table[ name ] = address;
}
insertInTable("f1", &f1);
insertInTable("f2", &f2);

mandel <oh no.es> writes:

ok, my previous was wrong.

You can also write:
void insert(int function(int) [ char[] ] table, char [] name, int function(int)
address) {
     table[ name ] = address;
}

funcAddressTable.insert("f1", &f1);
funcAddressTable.insert("f2", &f2);