I couldn’t find any documentation about lvalues in Swift. Can anybody give me a
short explanation of what exactly an lvalue is?
In C++ all variables, including those marked with the const modifier seem to be
lvalues. It seems to me, that this is not the case for let constants in Swift.
I compared the output of swiftc -dump-ast for
let i = 42
let j = i+1
and
var i = 42
let j = i+1
Where i was respectively accessed as:
(declref_expr type='Int' location=lvaluetest.swift:2:9
range=[lvaluetest.swift:2:9 - line:2:9]
decl=lvaluetest.(file).i@lvaluetest.swift:1:5 direct_to_storage specialized=no)
(load_expr implicit type='Int' location=lvaluetest.swift:2:9
range=[lvaluetest.swift:2:9 - line:2:9]
(declref_expr type='@lvalue Int' accessKind=read
location=lvaluetest.swift:2:9 range=[lvaluetest.swift:2:9 - line:2:9]
decl=lvaluetest.(file).i@lvaluetest.swift:1:5 direct_to_storage specialized=no))
Is my assumption correct, that let constants are not lvalues?
Cheers,
Tim
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