Re: Getting enum from value
On Saturday, 5 August 2017 at 18:26:10 UTC, Kreikey wrote:
On Saturday, 5 August 2017 at 15:33:57 UTC, Matthew Remmel
wrote:
I feel like I'm missing something, but there has to be an
easier way to convert a value into an enum than switching over
every possible value: i.e
[...]
Capitals c = cast(Capitals)"Chicago";
writeln(c);// Illinois
I'm annoyed that I didn't think of trying to cast it. That works
great if the value exists in the enum. It does something weird if
the value doesn't though. This is my test.d file:
import std.stdio;
enum Foo {
A = "AV",
B = "BV"
}
void main() {
Foo k = cast(Foo)"BV"; // Works and prints correctly
k = cast(Foo)"CV";
writeln("Type: ", typeid(k)); // Type: test.Foo
writeln("Value: ", k); // Value: cast(Foo)CV
}
The output shows the type being the Foo enum but the value is
'cast(Foo)CV'. I would of expected an error or exception to be
thrown if it wasn't able to cast into an actual enum member. Is
this something with how the enums are implemented under the hood?
Re: Getting enum from value
On Saturday, 5 August 2017 at 15:42:53 UTC, Rene Zwanenburg wrote:
On Saturday, 5 August 2017 at 15:33:57 UTC, Matthew Remmel
wrote:
Any ideas?
You can use to! in std.conv:
import std.stdio;
import std.conv;
enum Foo
{
A = "A",
B = "B"
}
void main()
{
writeln("A".to!Foo);
}
This only works because the enum name and the value are the same.
Its actually converting on the enum name, which happens to be the
same as the value. This doesn't work if the values is different:
enum Foo {
A = "AV",
B = "BV"
}
int main() {
writeln("AV".to!Foo); // Throws exceptions
return 0;
}
It looks like Temtaime's solution works:
enum Foo
{
A = "AV",
B = "BV",
C = "CV",
}
Foo K = [ EnumMembers!Foo ].find!(a => a == `BV`)[0];
I can probably make a template or something out of this to make
the syntax simpler.
Getting enum from value
I feel like I'm missing something, but there has to be an easier
way to convert a value into an enum than switching over every
possible value: i.e
enum Capitals {
Indiana = "Indianapolis",
Illinois = "Chicago",
Ohio = "Columbus"
}
Capitals enumFromValue(string s) {
switch (s) {
case Capitals.Indiana:
return Capitals.Indiana;
case Capitals.Illinois:
return Capitals.Illinois;
case Capitals.Ohio:
return Capitals.Ohio;
default:
throw new Exception(format("No Capitals enum member
with value %s", s));
}
}
int main() {
Capitals c = enumFromValue("Chicago"); // works
// I tried using std.conv, but it matches on the enum member
name
c = to!Capitals("Chicago") // fails, no member named Chicago
}
With how redundant the enumFromValue(string) implementation is, I
would think there would be an easier way to do it. I'm sure you
could use a mixin, a template, or std.traits. I was hoping there
was a more 'builtin' way to do it though. Something along the
simplicity of:
int main() {
Capitals c = Capitals("Chicago");
}
Any ideas?
Re: Get UDA of unit tests during Runtime.moduleUnitTester
On Wednesday, 26 July 2017 at 06:47:20 UTC, Jacob Carlborg wrote: On 2017-07-26 05:27, Matthew Remmel wrote: [...] Unless you want to go with the approach Seb suggested, using unit-threaded, you need to recursively iterate the module to get all aggregates using __traits(allMembers) then use __traits(getUnitTests) for each aggregate to get all unit tests. [...] That's not possible, the UDAs are lost after compile time. Also, all the unit tests block are combined into one function per module, which is what Runtime.moduleUnitTester is running. The separate unit test blocks are gone at runtime so there's nothing to connect the UDAs to. Thanks for the info, I'll look into the threaded unit test library and see what they are doing, and how. -Matt
Get UDA of unit tests during Runtime.moduleUnitTester
I'd like to print out the name given to a unit test via a UDA, as
the tests are being ran by the Runtime.moduleUnitTester. I'm
working on writing a custom unit test runner. It would seem that
the ModuleInfo.unitTest property is an aggregated function of all
the individual unit test blocks in a module, and therefore the
UDA value is lost.
I've been attempting to use the __traits(getUnitTests, m)
function, but that doesn't seem to work with ModuleInfo because
it is a variable and not a symbol. Additionally, if you run
__traits(getUnitTests, m) against a module, that doesn't retrieve
any unit tests that are nested inside classes or structs. So even
if it did work with ModuleInfo, there may still be problems.
What I would like is to have a module like:
___
module app;
int square(int x) { return x*x; }
@name("square test 1")
unittest {
assert(square(10) == 100);
}
@name("square test 2")
unittest {
assert(square(5) == 25);
}
class Foo {
void someFunc() { return; }
@name("Foo test")
unittest {
assert(someFunc() == something);
}
}
___
So as mentioned above, the first problem is that using
ModuleInfo.unitTest returns an aggregated function of all 3 unit
tests for that module, instead of each one individually, so the
UDA information is lost. The second problem is that running
__traits(getUnitTests, app) only returns the 2 tests at module
scope, and not the one nested inside Foo. Even then, I haven't
been able to figure out how to dynamically get the module symbol
to pass to __traits inside of the Runtime.moduleUnitTester
function.
Its possible that I've got some of this backwards and there is an
easy solution. Its also possible that what i'm trying to do isn't
currently possible.
Thanks in advance for any help.
--Matt
