feature: Make panic_if_null optional with panic-if-null feature

Author: jhg

Cargo.toml

@@ -18,3 +18,4 @@ alloc = []
 # Allow to use some functions for FFI C types
 c-types = ["std"]
 # Check pointers before to use it to panic if it is null
+panic-if-null = []

src/c.rs

@@ -5,6 +5,7 @@
 use std::os::raw::c_char;
 use std::ffi::CStr;
 
+#[cfg(any(feature = "panic-if-null", debug_assertions))]
 use super::panic_if_null;
 
 /// Convert a reference to a C string into a static reference to Rust `str`.
@@ -19,6 +20,7 @@ use super::panic_if_null;
 #[must_use]
 #[inline]
 pub unsafe fn ref_str<'a>(string: *const c_char) -> &'a str {
+    #[cfg(any(feature = "panic-if-null", debug_assertions))]
     panic_if_null(string);
     // CAUTION: this is unsafe
     let string = CStr::from_ptr(string);

src/lib.rs

@@ -24,6 +24,7 @@ use std::boxed::Box;
 #[cfg(all(feature = "std", feature = "c-types"))]
 pub mod c;
 
+#[cfg(any(feature = "panic-if-null", debug_assertions))]
 #[inline]
 fn panic_if_null<T>(pointer: *const T) {
     if pointer.is_null() {
@@ -69,6 +70,7 @@ pub unsafe fn free<T>(pointer: *mut T) {
 #[cfg(any(feature = "alloc", feature = "std"))]
 #[inline]
 pub unsafe fn own_back<T>(pointer: *mut T) -> T {
+    #[cfg(any(feature = "panic-if-null", debug_assertions))]
     panic_if_null(pointer);
     // CAUTION: this is unsafe
     let boxed = Box::from_raw(pointer);
@@ -87,6 +89,7 @@ pub unsafe fn own_back<T>(pointer: *mut T) -> T {
 /// That could produce a HEAP error that produce a crash.
 #[inline]
 pub unsafe fn object<'a, T>(pointer: *const T) -> &'a T {
+    #[cfg(any(feature = "panic-if-null", debug_assertions))]
     panic_if_null(pointer);
     // CAUTION: this is unsafe
     return &*pointer;
@@ -104,6 +107,7 @@ pub unsafe fn object<'a, T>(pointer: *const T) -> &'a T {
 /// That could produce a HEAP error that produce a crash.
 #[inline]
 pub unsafe fn mut_object<'a, T>(pointer: *mut T) -> &'a mut T {
+    #[cfg(any(feature = "panic-if-null", debug_assertions))]
     panic_if_null(pointer);
     // CAUTION: this is unsafe
     return &mut *pointer;