Monday, May 18, 2015

lval(i.e. L-value) - my definition, incl c++ func CALL

See also post on rval reference

int& foo();
int* p1 = &foo(); // ok, foo() is an lvalue
foo(5) = 42; // (A) ok, foo() is an lvalue. Java doesn’t allow it but does allow ...
java ##  foo[5]=42; // (B)

p1  = ... //ok
*p1 = ... //ok
*(...) = ...//ok. Most deference expressions can be L-value expressions

C++ lets you overload the subscript operator i.e. brackets so (B) can be implemented as a shorthand for (A).
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C# indexer and property both look like fields of an object (fields are L-values), but both get converted to getter/setter functions. Therefore they don't refer to memory locations. Therefore an indexer/property can't be ref or out arguments. They can be used as regular method arguments though, because they are good enough as R-values.

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