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//
// A rust binding for the GSL library by Guillaume Gomez (guillaume1.gomez@gmail.com)
//
/*!
# Multisets
This chapter describes functions for creating and manipulating multisets. A multiset c is represented by an array of k integers in the
range 0 to n-1, where each value c_i may occur more than once. The multiset c corresponds to indices of k elements chosen from an n element
vector with replacement. In mathematical terms, n is the cardinality of the multiset while k is the maximum multiplicity of any value.
Multisets are useful, for example, when iterating over the indices of a k-th order symmetric tensor in n-space.
!*/
use crate::Value;
use ffi::FFI;
use std::io;
ffi_wrapper!(MultiSet, *mut sys::gsl_multiset, gsl_multiset_free);
impl MultiSet {
/// This function allocates memory for a new multiset with parameters n, k. The multiset is not
/// initialized and its elements are undefined. Use the function [`Self::new_with_init`] if you
/// want to create a multiset which is initialized to the lexicographically first multiset
/// element. A null pointer is returned if insufficient memory is available to create the
/// multiset.
#[doc(alias = "gsl_multiset_alloc")]
pub fn new(n: usize, k: usize) -> Option<Self> {
let tmp = unsafe { sys::gsl_multiset_alloc(n, k) };
if tmp.is_null() {
None
} else {
Some(Self::wrap(tmp))
}
}
/// This function allocates memory for a new multiset with parameters n, k and initializes it to
/// the lexicographically first multiset element. A null pointer is returned if insufficient
/// memory is available to create the multiset.
#[doc(alias = "gsl_multiset_calloc")]
pub fn new_with_init(n: usize, k: usize) -> Option<Self> {
let tmp = unsafe { sys::gsl_multiset_calloc(n, k) };
if tmp.is_null() {
None
} else {
Some(Self::wrap(tmp))
}
}
/// This function initializes the multiset c to the lexicographically first multiset element,
/// i.e. 0 repeated k times.
#[doc(alias = "gsl_multiset_init_first")]
pub fn init_first(&mut self) {
unsafe { sys::gsl_multiset_init_first(self.unwrap_unique()) }
}
/// This function initializes the multiset c to the lexicographically last multiset element,
/// i.e. n-1 repeated k times.
#[doc(alias = "gsl_multiset_init_last")]
pub fn init_last(&mut self) {
unsafe { sys::gsl_multiset_init_last(self.unwrap_unique()) }
}
/// This function copies the elements of the multiset `self` into the multiset dest. The two
/// multisets must have the same size.
#[doc(alias = "gsl_multiset_memcpy")]
pub fn copy(&self, dest: &mut MultiSet) -> Result<(), Value> {
let ret = unsafe { sys::gsl_multiset_memcpy(dest.unwrap_unique(), self.unwrap_shared()) };
result_handler!(ret, ())
}
/// This function returns the value of the i-th element of the multiset c. If i lies outside the
/// allowed range of 0 to k-1 then the error handler is invoked and 0 is returned.
#[doc(alias = "gsl_multiset_get")]
pub fn get(&self, i: usize) -> usize {
unsafe { sys::gsl_multiset_get(self.unwrap_shared(), i) }
}
/// This function returns the range (n) of the multiset `self`.
#[doc(alias = "gsl_multiset_n")]
pub fn n(&self) -> usize {
unsafe { sys::gsl_multiset_n(self.unwrap_shared()) }
}
/// This function returns the number of elements (k) in the multiset `self`.
#[doc(alias = "gsl_multiset_k")]
pub fn k(&self) -> usize {
unsafe { sys::gsl_multiset_k(self.unwrap_shared()) }
}
/// This function returns a pointer to the array of elements in the multiset `self`.
#[doc(alias = "gsl_multiset_data")]
pub fn data(&self) -> &[usize] {
unsafe {
let ptr = sys::gsl_multiset_data(self.unwrap_shared());
std::slice::from_raw_parts(ptr, self.k())
}
}
/// This function returns a pointer to the array of elements in the multiset `self`.
// checker:ignore
#[doc(alias = "gsl_multiset_data")]
pub fn data_mut(&mut self) -> &mut [usize] {
unsafe {
let ptr = sys::gsl_multiset_data(self.unwrap_shared());
std::slice::from_raw_parts_mut(ptr, self.k())
}
}
/// This function checks that the multiset self is valid. The k elements should lie in the range
/// 0 to n-1, with each value occurring in non-decreasing order.
///
/// Returns `OK(())` if valid.
#[doc(alias = "gsl_multiset_valid")]
pub fn valid(&self) -> Result<(), Value> {
// Little trick here: the function is expecting a mutable pointer whereas it doesn't need
// to be...
let ret = unsafe { sys::gsl_multiset_valid(self.inner) };
result_handler!(ret, ())
}
/// This function advances the multiset self to the next multiset element in lexicographic order
/// and returns `Ok(())`. If no further multisets elements are available it returns
/// [`Err(Value::Failure)`](Value::Failure) and leaves self unmodified. Starting with the first
/// multiset and repeatedly applying this function will iterate through all possible multisets
/// of a given order.
#[doc(alias = "gsl_multiset_next")]
pub fn next(&mut self) -> Result<(), Value> {
let ret = unsafe { sys::gsl_multiset_next(self.unwrap_unique()) };
result_handler!(ret, ())
}
/// This function steps backwards from the multiset self to the previous multiset element in
/// lexicographic order, returning [`Value::Success`]. If no previous multiset is available it
/// returns [`Value::Failure`] and leaves self unmodified.
#[doc(alias = "gsl_multiset_prev")]
pub fn prev(&mut self) -> Result<(), Value> {
let ret = unsafe { sys::gsl_multiset_prev(self.unwrap_unique()) };
result_handler!(ret, ())
}
pub fn print<W: io::Write>(&self, writer: &mut W) -> io::Result<()> {
write!(writer, "{:?}", self.data())
}
}