digitalmars.D.learn - Safer binary reading (or writing) code
I've got this mixin thing, I think it's less typo-prone. I
haven't been able to make it show the variable's name, though.
Also, it should be optional whether it prints anything, (it's not
hard for me to do that though).
```d
// mixin(jread("width")); -> fread(&width, 1, width.sizeof,
bfile);
auto jread(string var) => `fread(&`~var~`, 1, `~var~`.sizeof,
bfile); writeln("read var=", `~var~`);`;
```
Dec 12 2023
Joel <joelcnz gmail.com>
On Tuesday, 12 December 2023 at 09:43:39 UTC, Joel wrote:
I've got this mixin thing, I think it's less typo-prone. I
haven't been able to make it show the variable's name, though.
Also, it should be optional whether it prints anything, (it's
not hard for me to do that though).
```d
// mixin(jread("width")); -> fread(&width, 1, width.sizeof,
bfile);
auto jread(string var) => `fread(&`~var~`, 1, `~var~`.sizeof,
bfile); writeln("read var=", `~var~`);`;
```
O, got it:
```d
auto jread(string var) => `fread(&`~var~`, 1, `~var~`.sizeof,
bfile); writeln("read `~var~`=", `~var~`);`;
```
Dec 12 2023
On Tuesday, 12 December 2023 at 09:43:39 UTC, Joel wrote:
I've got this mixin thing, I think it's less typo-prone. I
haven't been able to make it show the variable's name, though.
Also, it should be optional whether it prints anything, (it's
not hard for me to do that though).
```d
// mixin(jread("width")); -> fread(&width, 1, width.sizeof,
bfile);
auto jread(string var) => `fread(&`~var~`, 1, `~var~`.sizeof,
bfile); writeln("read var=", `~var~`);`;
```
When I need to insert a variable name numerous times into a bit
of mixin code, I often use a replace pattern like this:
```d
mixin(q{
static struct _aa_$FIELD {
KeyType!(typeof(field)) key;
ValueType!(typeof(field)) val;
}
Array!(_aa_$FIELD) $FIELD;
}.replace("$FIELD", myVariableName));
```
Dec 13 2023