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digitalmars.D.learn - Check whether string value represents a type

reply Timoses <timosesu gmail.com> writes:
I'd love to check whether a string value is the name of a type at 
run-time.

E.g.:


string a = "int";
string b = "im no type";
assert( isStringType(a) );
assert( !isStringType(b) );

or

struct TestStruct
{
     int test;
}

string t = "TestStruct";
assert( isStringType(t) );


Is anything like this possible?

The goal is to identify whether a string represents a custom type 
within a package. I'm also trying to iterate over all modules 
within the package to get the struct name. However, that seems 
like a struggle...

Any ideas?..
Jul 21
next sibling parent reply Steven Schveighoffer <schveiguy yahoo.com> writes:
On 7/21/17 10:21 AM, Timoses wrote:
 I'd love to check whether a string value is the name of a type at run-time.
 
 E.g.:
 
 
 string a = "int";
 string b = "im no type";
 assert( isStringType(a) );
 assert( !isStringType(b) );
 
 or
 
 struct TestStruct
 {
      int test;
 }
 
 string t = "TestStruct";
 assert( isStringType(t) );
 
 
 Is anything like this possible?
 
 The goal is to identify whether a string represents a custom type within 
 a package. I'm also trying to iterate over all modules within the 
 package to get the struct name. However, that seems like a struggle...
 
 Any ideas?..
In order to do this, the list of types must be stored somewhere to compare with at runtime. At this time, this is not done. You could potentially do this with the RTInfo template, but it would have to be part of a custom druntime. -Steve
Jul 21
parent Timoses <timosesu gmail.com> writes:
On Friday, 21 July 2017 at 14:44:23 UTC, Steven Schveighoffer 
wrote:
 On 7/21/17 10:21 AM, Timoses wrote:
 I'd love to check whether a string value is the name of a type 
 at run-time.
 
 E.g.:
 
 
 string a = "int";
 string b = "im no type";
 assert( isStringType(a) );
 assert( !isStringType(b) );
 
 or
 
 struct TestStruct
 {
      int test;
 }
 
 string t = "TestStruct";
 assert( isStringType(t) );
 
 
 Is anything like this possible?
 
 The goal is to identify whether a string represents a custom 
 type within a package. I'm also trying to iterate over all 
 modules within the package to get the struct name. However, 
 that seems like a struggle...
 
 Any ideas?..
In order to do this, the list of types must be stored somewhere to compare with at runtime. At this time, this is not done. You could potentially do this with the RTInfo template, but it would have to be part of a custom druntime. -Steve
Thanks Steve! That's sound too much of a strugge for a newbie like me : D. I'll probably evaluate and compare the type names as strings then and derive further processing from there.
Jul 23
prev sibling parent reply Basile B. <b2.temp gmx.com> writes:
On Friday, 21 July 2017 at 14:21:37 UTC, Timoses wrote:
 I'd love to check whether a string value is the name of a type 
 at run-time.
 [...]
 The goal is to identify whether a string represents a custom 
 type within a package. I'm also trying to iterate over all 
 modules within the package to get the struct name. However, 
 that seems like a struggle...

 Any ideas?..
I used custom Runtime Type Infos for this: https://github.com/BBasile/iz/blob/master/import/iz/rtti.d#L550 Each type for which that's interesting to have extra information is registered. When a type is not registered than it can be considered as not a type.
Jul 24
parent Timoses <timosesu gmail.com> writes:
On Monday, 24 July 2017 at 07:08:56 UTC, Basile B. wrote:
 On Friday, 21 July 2017 at 14:21:37 UTC, Timoses wrote:
 I'd love to check whether a string value is the name of a type 
 at run-time.
 [...]
 The goal is to identify whether a string represents a custom 
 type within a package. I'm also trying to iterate over all 
 modules within the package to get the struct name. However, 
 that seems like a struggle...

 Any ideas?..
I used custom Runtime Type Infos for this: https://github.com/BBasile/iz/blob/master/import/iz/rtti.d#L550 Each type for which that's interesting to have extra information is registered. When a type is not registered than it can be considered as not a type.
Awesome, that's helping a lot : D.
Jul 24