In C and C++ you can get the name of the currently executing function through the __func__
macro with C99 & C++11 and ___FUNCTION___
for MSVC.
You can hack one together with std::any::type_name
.
macro_rules! function {
() => {{
fn f() {}
fn type_name_of<T>(_: T) -> &'static str {
std::any::type_name::<T>()
}
let name = type_name_of(f);
&name[..name.len() - 3]
}}
}
Note that this gives a full pathname, so my::path::my_func
instead of just my_func
. A demo is available.
Adding to Veedrac's answer, you can get the function's name without its full path by adding this:
macro_rules! function {
() => {{
fn f() {}
fn type_name_of<T>(_: T) -> &'static str {
std::any::type_name::<T>()
}
let name = type_name_of(f);
// Find and cut the rest of the path
match &name[..name.len() - 3].rfind(':') {
Some(pos) => &name[pos + 1..name.len() - 3],
None => &name[..name.len() - 3],
}
}};
}
You will get my_func
instead of my::path::my_func
for example.
There was an RFC about this, but it was never agreed upon or implemented.
The rationale for its absence:
"In general I don't think any of us have given an inordinate amount of thought to these "debugging related" macros in terms of long term stability. Most of them seem fairly harmless, but committing to provide all of them for all Rust programs forever is a strong commitment to make. We may want to briefly consider the story of these macros in conjunction with considering adding this new macro."
Maybe Rust will have something comparable in the future,
but for now you will need to rely on your own tagging.
side note: __FUNCTION__
is non standard, __func__
exists in C99 / C++11.