On Monday, 20 December 2021 at 08:45:50 UTC, rempas wrote:
Here I am having a problem with templates again. No matter how
much I read, I can't seem to understand how templates/mixins
work.
So any ideas why this doesn't work?
because you cannot have statements directly in a template (the
fact that is a mixin template is irelevant), only declarations.
If you want to just insert some random code, use strings. You can
create a templated enum to store your parametrized string. Please
note how your parameter (c) becomes part of the resulting string
through concatenation (~):
```
enum add_char(char c) =
`if (stdout_index < STDOUT_BUF_LEN) {
stdout_buffer[stdout_index++] =` ~ c ~ `;
continue;
} else {
sys_write(1, stdout_buffer.ptr, cast(i32)stdout_index);
stdout_index = 0;
stdout_buffer[stdout_index++] =` ~ c ~ `;
continue;
}`;
```
and when you want the code inserted:
```
mixin(add_char!'%');
```
If you want to be sure that your string is syntactically correct,
use token strings (https://dlang.org/spec/lex.html#token_strings)
