Re: Can't print enum values
On Friday, 31 August 2018 at 12:21:48 UTC, aliak wrote:
auto ToUnderlyingType(alias a)() {
return cast(OriginalType!(typeof(a)))a;
}
void print(T...)(T args) {
writeln(staticMap!(ToUnderlyingType, args));
}
Oohhh. So easy! Killed 2 days - and templates and mixins tried...
And the solution was to use TEMPLATE function with alias not
regular...
Thank you!
Re: Can't print enum values
On Friday, 31 August 2018 at 10:51:51 UTC, Andrey wrote:
On Thursday, 30 August 2018 at 12:04:26 UTC, vit wrote:
On Thursday, 30 August 2018 at 11:34:36 UTC, Andrey wrote:
On Thursday, 30 August 2018 at 11:09:40 UTC, vit wrote:
[...]
I want to create a reusable template for this purpose.
Why I can't use "staticMap" so that compiler it self would do
this:
[...]
Just wrap some some symbol "args" with some expression at
compile time.
It is the same as in C++:
[...]
D doesn't have expanding like C++
Unfortunately D has only simple automatic expading.
So how can one implement a reusable template "apply some
function to each argument in template parameter pack" in D?
auto ToUnderlyingType(alias a)() {
return cast(OriginalType!(typeof(a)))a;
}
void print(T...)(T args) {
writeln(staticMap!(ToUnderlyingType, args));
}
Re: Can't print enum values
On Thursday, 30 August 2018 at 12:04:26 UTC, vit wrote: On Thursday, 30 August 2018 at 11:34:36 UTC, Andrey wrote: On Thursday, 30 August 2018 at 11:09:40 UTC, vit wrote: [...] I want to create a reusable template for this purpose. Why I can't use "staticMap" so that compiler it self would do this: [...] Just wrap some some symbol "args" with some expression at compile time. It is the same as in C++: [...] D doesn't have expanding like C++ Unfortunately D has only simple automatic expading. So how can one implement a reusable template "apply some function to each argument in template parameter pack" in D?
Re: Can't print enum values
On Thursday, 30 August 2018 at 11:34:36 UTC, Andrey wrote: On Thursday, 30 August 2018 at 11:09:40 UTC, vit wrote: [...] I want to create a reusable template for this purpose. Why I can't use "staticMap" so that compiler it self would do this: [...] Just wrap some some symbol "args" with some expression at compile time. It is the same as in C++: [...] D doesn't have expanding like C++ Unfortunately D has only simple automatic expading.
Re: Can't print enum values
On Thursday, 30 August 2018 at 11:09:40 UTC, vit wrote:
args are runtime arguments.
import std.experimental.all;
enum MyEnum : string
{
First = "F_i_r_s_t",
Second = "S_e_c_o_n_d"
}
///alias QW(alias arg) =
Alias!(cast(OriginalType!(typeof(arg)))arg);
auto QW(T)(const auto ref T x){
return cast(OriginalType!T)x;
}
void print(T...)(T args)
{
writeln(cast(OriginalType!(typeof(args[0])))args[0]); //
Works...
///writeln(QW!(args[0]));//
Doesn't work... MUST!
writeln(QW(args[0]));
static foreach(alias arg; args){
static if(is(typeof(arg) : MyEnum))write(QW(arg));
else write(arg);
}
write('\n');
//writeln(staticMap!(QW, args));//
Doesn't work... MUST!
}
void main()
{
bool runTimeBool = true;
print(MyEnum.First, 7, runTimeBool, MyEnum.Second);
}
I want to create a reusable template for this purpose.
Why I can't use "staticMap" so that compiler it self would do
this:
void print(T...)(T args)
{
writeln(cast(OriginalType!(typeof(args[0])))args[0],
cast(OriginalType!(typeof(args[1])))args[1],
cast(OriginalType!(typeof(args[2])))args[2],
cast(OriginalType!(typeof(args[3])))args[3]);
}
Just wrap some some symbol "args" with some expression at compile
time.
It is the same as in C++:
template
void print(Args ...args)
{
writeln(UnderlyingType(args)...); // UnderlyingType is a
function here
}
Re: Can't print enum values
On Thursday, 30 August 2018 at 10:41:58 UTC, Andrey wrote:
Hello,
This code doesn't print enum values:
import std.meta;
import std.traits;
import std.stdio;
enum MyEnum : string
{
First = "F_i_r_s_t",
Second = "S_e_c_o_n_d"
}
alias QW(alias arg) =
Alias!(cast(OriginalType!(typeof(arg)))arg);
void print(T...)(T args)
{
writeln(cast(OriginalType!(typeof(args[0])))args[0]); //
Works...
writeln(QW!(args[0]));//
Doesn't work... MUST!
writeln(staticMap!(QW, args));//
Doesn't work... MUST!
}
void main()
{
bool runTimeBool = true;
print(MyEnum.First, 7, runTimeBool, MyEnum.Second);
}
Must print "F_i_r_s_t" and "S_e_c_o_n_d", not just "First" and
"Second".
args are runtime arguments.
import std.experimental.all;
enum MyEnum : string
{
First = "F_i_r_s_t",
Second = "S_e_c_o_n_d"
}
///alias QW(alias arg) =
Alias!(cast(OriginalType!(typeof(arg)))arg);
auto QW(T)(const auto ref T x){
return cast(OriginalType!T)x;
}
void print(T...)(T args)
{
writeln(cast(OriginalType!(typeof(args[0])))args[0]); //
Works...
///writeln(QW!(args[0]));//
Doesn't work... MUST!
writeln(QW(args[0]));
static foreach(alias arg; args){
static if(is(typeof(arg) : MyEnum))write(QW(arg));
else write(arg);
}
write('\n');
//writeln(staticMap!(QW, args));//
Doesn't work... MUST!
}
void main()
{
bool runTimeBool = true;
print(MyEnum.First, 7, runTimeBool, MyEnum.Second);
}
Can't print enum values
Hello,
This code doesn't print enum values:
import std.meta;
import std.traits;
import std.stdio;
enum MyEnum : string
{
First = "F_i_r_s_t",
Second = "S_e_c_o_n_d"
}
alias QW(alias arg) =
Alias!(cast(OriginalType!(typeof(arg)))arg);
void print(T...)(T args)
{
writeln(cast(OriginalType!(typeof(args[0])))args[0]); //
Works...
writeln(QW!(args[0]));//
Doesn't work... MUST!
writeln(staticMap!(QW, args));//
Doesn't work... MUST!
}
void main()
{
bool runTimeBool = true;
print(MyEnum.First, 7, runTimeBool, MyEnum.Second);
}
Must print "F_i_r_s_t" and "S_e_c_o_n_d", not just "First" and
"Second".
