• PacMan (4/13) Nov 26 2018 f is defined as:
• Soulsbane (12/25) Nov 26 2018 If I'm understanding right I need this quite frequently so I
• Neia Neutuladh (7/16) Nov 26 2018 `f` is a template that generates functions. Before you instantiate that
• bauss (2/15) Nov 27 2018 p.stringof

PacMan <jckj33 gmail.com> writes:

ParameterIdentifierTuple from std.traits did work fine for 
regular functions but not for template functions:

 Error: template instance 
 `std.traits.ParameterIdentifierTuple!(f)` does not match 
 template declaration `ParameterIdentifierTuple(func...) if 
 (func.length == 1 && isCallable!func)` (foo)

f is defined as:

 void f(T)(T t, string p)
 if(is(T == A) || is(T == B))
{
	// ...
}

my goal is get "p" as string.

Soulsbane <paul acheronsoft.com> writes:

On Tuesday, 27 November 2018 at 02:00:44 UTC, PacMan wrote:
 ParameterIdentifierTuple from std.traits did work fine for 
 regular functions but not for template functions:

 Error: template instance 
 `std.traits.ParameterIdentifierTuple!(f)` does not match 
 template declaration `ParameterIdentifierTuple(func...) if 
 (func.length == 1 && isCallable!func)` (foo)

 f is defined as:

 void f(T)(T t, string p)
 if(is(T == A) || is(T == B))
{
	// ...
}

 my goal is get "p" as string.

If I'm understanding right I need this quite frequently so I 
wrote this:

template nameOf(alias nameType)
{
	enum string nameOf = __traits(identifier, nameType);
}

unittest
{
	immutable int name;
	assert(nameOf!name == "name");
}

Neia Neutuladh <neia ikeran.org> writes:

On Tue, 27 Nov 2018 02:00:44 +0000, PacMan wrote:
 f is defined as:
 
 void f(T)(T t, string p)
 if(is(T == A) || is(T == B))
{
	// ...
}

 
 my goal is get "p" as string.

`f` is a template that generates functions. Before you instantiate that 
template, the function doesn't exist, so there's no function to get 
parameters from.

You can get the parameter names of any instantiation of that template, 
such as:

    assert(ParameterIdentifierTuple!(f!A)[1] == "p");

bauss <jj_1337 live.dk> writes:

On Tuesday, 27 November 2018 at 02:00:44 UTC, PacMan wrote:
 ParameterIdentifierTuple from std.traits did work fine for 
 regular functions but not for template functions:

 Error: template instance 
 `std.traits.ParameterIdentifierTuple!(f)` does not match 
 template declaration `ParameterIdentifierTuple(func...) if 
 (func.length == 1 && isCallable!func)` (foo)

 f is defined as:

 void f(T)(T t, string p)
 if(is(T == A) || is(T == B))
{
	// ...
}

 my goal is get "p" as string.

p.stringof