Re: Get function argument name?

[Timothee Cour via Digitalmars-d-learn]

`printName(alias var)()` is not a great solution, eg: doesn't work
with expressions, doesn't work with variadics, introduces template
bloat.

https://github.com/dlang/dmd/pull/7821 introduces
__traits(getCallerSource, symbol) which will allow what you want.

On Sun, Mar 4, 2018 at 1:53 PM, bauss via Digitalmars-d-learn
 wrote:
> On Sunday, 4 March 2018 at 21:48:53 UTC, JN wrote:
>>
>> On Sunday, 4 March 2018 at 21:12:44 UTC, arturg wrote:
>>>
>>>
>>> you can pass it by alias:
>>>
>>> import std.stdio;
>>>
>>> void main(string[] args)
>>> {
>>> int x;
>>> printName!(x);
>>> }
>>>
>>> void printName(alias var)()
>>> {
>>> writeln(__traits(identifier, var), " ", var);
>>> }
>>
>>
>> Well, it works. But I am confused now, why. Isn't alias only for types
>> (like a typedef)? Why can we use it for variable here?
>
>
> Because it is what it is, an alias. Not a type.
>
> It can be a type, expression or member/variable.

Re: Get function argument name?

[bauss via Digitalmars-d-learn]

On Sunday, 4 March 2018 at 21:48:53 UTC, JN wrote:

On Sunday, 4 March 2018 at 21:12:44 UTC, arturg wrote:


you can pass it by alias:

import std.stdio;

void main(string[] args)
{
int x;
printName!(x);
}

void printName(alias var)()
{
writeln(__traits(identifier, var), " ", var);
}


Well, it works. But I am confused now, why. Isn't alias only 
for types (like a typedef)? Why can we use it for variable here?


Because it is what it is, an alias. Not a type.

It can be a type, expression or member/variable.

Re: Get function argument name?

[JN via Digitalmars-d-learn]

On Sunday, 4 March 2018 at 21:12:44 UTC, arturg wrote:


you can pass it by alias:

import std.stdio;

void main(string[] args)
{
int x;
printName!(x);
}

void printName(alias var)()
{
writeln(__traits(identifier, var), " ", var);
}


Well, it works. But I am confused now, why. Isn't alias only for 
types (like a typedef)? Why can we use it for variable here?

Re: Get function argument name?

[arturg via Digitalmars-d-learn]

On Sunday, 4 March 2018 at 21:03:04 UTC, JN wrote:

Imagine a function like this:

void printValue(T)(string name, T value)
{
  writeln(name, " = ", value);
}

int x = 10;
printValue("x", x);

is it somehow possible to convert that printValue into a mixin 
or something, so I could do something like:


printValue(x);

and it will figure out the "x" part automatically?


you can pass it by alias:

import std.stdio;

void main(string[] args)
{
int x;
printName!(x);
}

void printName(alias var)()
{
writeln(__traits(identifier, var), " ", var);
}

Get function argument name?

[JN via Digitalmars-d-learn]

Imagine a function like this:

void printValue(T)(string name, T value)
{
  writeln(name, " = ", value);
}

int x = 10;
printValue("x", x);

is it somehow possible to convert that printValue into a mixin or 
something, so I could do something like:


printValue(x);

and it will figure out the "x" part automatically?