Using FFI to write a std::string to a buffer passed in from D

[Johan]

On Sunday, 21 July 2024 at 13:35:46 UTC, Troy wrote:
>
> void create(void* b) {
> 	std::string s = "engineer again";
> 	*(std::string*)(b) = s;// Segfault here
> }

You have to construct an empty string object first in location 
`b` (emplacement new). Then you can assign to it as you do.
The `=` calls `operator=` which assumes that both operands (`b` 
and `s`) are both fully constructed and valid `std::string` 
objects. Without emplacement new, `b` is not a valid 
`std::string` object (random byte buffer returned by `malloc`).

Hope that works,
   Johan