nlohmann::byte_container_with_subtype::subtype

constexpr subtype_type subtype() const noexcept;

Returns the numerical subtype of the value if it has a subtype. If it does not have a subtype, this function will return subtype_type(-1) as a sentinel value.

Return value

the numerical subtype of the binary value, or subtype_type(-1) if no subtype is set

Exception safety

No-throw guarantee: this function never throws exceptions.

Complexity

Constant.

Version history

• Added in version 3.8.0
• Fixed return value to properly return subtype_type(-1) as documented in version 3.10.0.