Enum StringTypeMode 

pub enum StringTypeMode {
    Owned,
    Borrowed,
}

Controls whether string and binary ASN.1 types are generated as owned heap-allocating types or as zero-copy borrowed references.

The following ASN.1 types have both an owned form and a zero-copy Ref variant and are therefore affected by this setting:

ASN.1 type	Owned (Owned mode)	Borrowed (Borrowed mode)
OCTET STRING	OctetString	OctetStringRef<'a>
BIT STRING	BitString	BitStringRef<'a>
UTF8String	Utf8String	Utf8StringRef<'a>
PrintableString	PrintableString	PrintableStringRef<'a>
IA5String	IA5String	IA5StringRef<'a>

Types that have no zero-copy variant (TeletexString, BmpString, UniversalString, GeneralString, NumericString, VisibleString) are always emitted as owned types regardless of this setting.

Named bit strings (BIT STRING { flag(0), … }) are always emitted as owned BitString regardless of this setting because they are decoded into a concrete bit-field type.

• StringTypeMode::Owned (default): heap-allocates on decode; convenient for constructing structs from scratch (e.g. in tests or protocol message builders).
• StringTypeMode::Borrowed: borrows directly from the input buffer; optimal for parse-only workloads such as X.509 certificate inspection. Every struct that contains these fields (directly or transitively) gains a 'a lifetime parameter.

Variants

Owned

Generate owned, heap-allocating types (OctetString, BitString, …). No lifetime parameter is added to generated structs.

Borrowed

Generate zero-copy borrowed types (OctetStringRef<'a>, BitStringRef<'a>, …) that borrow from the decoder’s input buffer. Structs containing these fields acquire a 'a lifetime parameter.

Trait Implementations

impl Clone for StringTypeMode

fn clone(&self) -> StringTypeMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for StringTypeMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for StringTypeMode

fn default() -> StringTypeMode

Returns the “default value” for a type.

impl Eq for StringTypeMode

impl PartialEq for StringTypeMode

fn eq(&self, other: &StringTypeMode) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for StringTypeMode