封这个openssl库的作者给的例子里的写法。
它的实现里面也是这种写法。
就是把一个大整数格式化为字符串,这个字符串封成OpensslString、OpensslStringRef
foreign_type_and_impl_send_sync! {
type CType = c_char;
fn drop = free;
pub struct OpensslString;
pub struct OpensslStringRef;
}
impl fmt::Display for OpensslString {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(&**self, f)
}
}
impl fmt::Debug for OpensslString {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Debug::fmt(&**self, f)
}
}
impl Stackable for OpensslString {
type StackType = ffi::stack_st_OPENSSL_STRING;
}
impl AsRef<str> for OpensslString {
fn as_ref(&self) -> &str {
&**self
}
}
impl AsRef<[u8]> for OpensslString {
fn as_ref(&self) -> &[u8] {
self.as_bytes()
}
}
impl Deref for OpensslStringRef {
type Target = str;
fn deref(&self) -> &str {
unsafe {
let slice = CStr::from_ptr(self.as_ptr()).to_bytes();
str::from_utf8_unchecked(slice)
}
}
}
impl AsRef<str> for OpensslStringRef {
fn as_ref(&self) -> &str {
&*self
}
}
impl AsRef<[u8]> for OpensslStringRef {
fn as_ref(&self) -> &[u8] {
self.as_bytes()
}
}
【 在 KEILLY 的大作中提到: 】
: 不能省略?
: 我记得好像有好几个可省略的地方。。
: :
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