I have complex number data filled into a Vec<f64> by an external C library (prefer not to change) in the form [i_0_real, i_0_imag, i_1_real, i_1_imag, ...] and it appears that this Vec<f64> has the same memory layout as a Vec<num_complex::Complex<f64>> of half the length would be, given that num_complex::Complex<f64>'s data...
I have a custom struct like the following:Is it possible to get the number of struct fields programmatically (like, for example, via a method call field_count()):
Assumption -- The Vec<f32> does not have any NaN values or exhibit any NaN behavior.Take the following sample set:
Rust has the concepts of ownership and borrowing. If a function doesn't borrow its parameter as a reference, the arguments to that function are moved and will be deallocated once they go out of scope.
I have two variables of type &T, x and y, which I swap locally inside a function:This code fails to compile, giving the following error:
Here is an exampleIs there a way to unborrow the reference without creating a new block or abstract into function?
I'm building a library that implements string joins; that is, printing all the elements of a container separated by a separator. My basic design looks like this:
I'm parsing a vector of tokens, each of enum type. This means I get a lot of code like:This is pretty ugly - and I've worked out that I can do this to make it a little nicer:
Horse is a struct which implements the Animal trait. I have an Rc<Horse> and a function that needs to take in an Rc<Animal>, so I want to convert from Rc<Horse> to Rc<Animal>.
This question already has an answer here:I am making a simple console program that converts between Celsius and Fahrenheit. The program takes user input multiple times, once for the type of conversion and once for the value to convert. When I run the program it compiles and runs without error,...