On Sunday, 11 October 2020 at 06:53:59 UTC, Andrey wrote:
Hello,
How to count a number of parameters in uninitialized template
method?
For example:
struct Test
{
void abc(int a, bool status, string text)() {}
{
The method "Test.abc" has three template paramenters.
I know that "TemplateArgsOf" exists but it is used only for
INITIALIZED templates...
You can count the commas in the text representation but this is
not a good solution. The default value of a
TemplateValueParameter can lead to wrong results, for example if
it's an array literal or a string literal.
---
size_t countTP(alias T)()
{
import std.algorithm : count;
return T.stringof.count(',') + 1;
}
template T1(A){}
template T2(A,B){}
template T3(A,B,C){}
void main()
{
pragma(msg, countTP!T1);
pragma(msg, countTP!T2);
pragma(msg, countTP!T3);
}
---
probably the countTP function can be enhanced to handle corner
cases I mentioned.
