48 lines
1.9 KiB
Plaintext
48 lines
1.9 KiB
Plaintext
import t
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# Variant type tags (fixed enumeration + custom pointer type)
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define VARIANT_NONE = 0 # Untyped / null value
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define VARIANT_INT = 1 # int (i64)
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define VARIANT_FLOAT = 2 # float (f32)
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define VARIANT_DOUBLE = 3 # double (f64)
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define VARIANT_STR = 4 # str (i8*)
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define VARIANT_DICT = 5 # dict*
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define VARIANT_LIST = 6 # list*
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define VARIANT_BOOL = 7 # bool (i1/i32)
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define VARIANT_PTR = 8 # Custom pointer type
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class Variant:
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"""Generic variant type storing a type tag and untyped pointer.
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Used for universal object storage inside dict/list, supports nesting and JSON serialization.
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Usage:
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v: Variant = Variant(VARIANT_INT, t.CNeedPtr(42))
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v2: Variant = Variant(VARIANT_STR, t.CNeedPtr("hello"))
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# Retrieve value
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ptr: rawptr = v.ptr
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i: int = *((int*)(ptr)) # int 值按 i32 存，读回须给 int* 视图
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"""
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vtype: int
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ptr: rawptr
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def __init__(self, vtype: int, val: t.CNeedPtr):
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"""Construct Variant instance.
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t.CNeedPtr automatically obtains address of val (non-pointer values will be allocated on stack and stored).
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Note: The lifecycle of val is managed by the caller; Variant only stores a pointer reference.
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"""
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self.vtype = vtype
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self.ptr = val
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def is_none(self) -> int: return self.vtype == VARIANT_NONE
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def is_int(self) -> int: return self.vtype == VARIANT_INT
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def is_float(self) -> int: return self.vtype == VARIANT_FLOAT
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def is_double(self) -> int: return self.vtype == VARIANT_DOUBLE
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def is_str(self) -> int: return self.vtype == VARIANT_STR
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def is_dict(self) -> int: return self.vtype == VARIANT_DICT
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def is_list(self) -> int: return self.vtype == VARIANT_LIST
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def is_bool(self) -> int: return self.vtype == VARIANT_BOOL
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def is_ptr(self) -> int: return self.vtype == VARIANT_PTR
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