How to add a character literal to a string without ~ operator?

[user1234]

On Thursday, 4 April 2024 at 19:56:50 UTC, Ferhat Kurtulmuş wrote:
> On Thursday, 4 April 2024 at 18:14:54 UTC, BoQsc wrote:
>> I'm looking for more readable standard function to add a 
>> **character** literal to a **string**.
>>
>> The `~` operator is clearly not great while reading a source 
>> code.
>> I'm not here to discuss that. I'm looking for a function 
>> inside standard library.
>>
>> The function should be straightforward, up to two words.
>>
>> Here is what I expect from a programming language:
>>
>> Pseudo example:
>> ```
>> import std;
>> void main(){
>> 	string word = hello;
>> 	join(word, 'f', " ", "World");
>> 	writeln(word);   	// output: hellof World
>> 	
>> }
>> 	
>> ```
>
> My favorite d feature is lazy ranges. No allocation here.
>
> ```
> auto s = chain("as ", "df ", "j"); // s is lazy
> writeln(s);
> ```
>
> Of course you can allocate a new string from the chained range:
> ```
> string str = cast(string)s.array.assumeUnique; // without a 
> cast it is a dstring (why though?)
> ```

```d
module runnable;

import std.stdio : writeln;
import std.range : chain;

void main() @nogc
{
     auto s = chain("as ", "df ", "j"); // s is lazy
     writeln(s);
}
```

Bad example. The range is indeed a `@nogc` lazy input range but 
`writeln` is not a `@nogc` consumer.

>/tmp/temp_7F91F8531AB0.d(9,12): Error: `@nogc` function `D main` 
>cannot call non- at nogc function 
>`std.stdio.writeln!(Result).writeln`
> /bin/ldc2-/bin/../import/std/stdio.d(4292,6):        which 
> calls `std.stdio.trustedStdout`

The input range consumer has to be @nogc as well.