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c++ Programming Glossary: glvalue

Accessing inactive union member - undefined?

http://stackoverflow.com/questions/11373203/accessing-inactive-union-member-undefined

conversion 4.1 Lvalue to rvalue conversion conv.lval A glvalue of a non function non array type T can be converted to a prvalue... this conversion is ill formed. If the object to which the glvalue refers is not an object of type T and is not an object of a..

Does initialization entail lvalue-to-rvalue conversion? Is `int x = x;` UB?

http://stackoverflow.com/questions/14935722/does-initialization-entail-lvalue-to-rvalue-conversion-is-int-x-x-ub

a null pointer constant 4.10 conv.ptr . Otherwise if the glvalue T has a class type the conversion copy initializes a temporary.. conversion copy initializes a temporary of type T from the glvalue and the result of the conversion is a prvalue for the temporary... for the temporary. Otherwise if the object to which the glvalue refers contains an invalid pointer value 3.7.4.2 basic.stc.dynamic.deallocation..

What are rvalues, lvalues, xvalues, glvalues, and prvalues?

http://stackoverflow.com/questions/3601602/what-are-rvalues-lvalues-xvalues-glvalues-and-prvalues

are rvalues lvalues xvalues glvalues and prvalues In C 03 an expression is either an rvalue or.. . In C 11 an expression can be an rvalue lvalue xvalue glvalue prvalue Two categories have become five categories. What are.. whose return type is an rvalue reference is an xvalue. A glvalue 𦤦eneralized lvalue is an lvalue or an xvalue . An rvalue so..

Unsequenced value computations (a.k.a sequence points)

http://stackoverflow.com/questions/3852768/unsequenced-value-computations-a-k-a-sequence-points

including determining the identity of an object for glvalue evaluation and fetching a value previously assigned to an object.. Evaluate the inner 1 and the value prvalue and address glvalue of x . Now we need the value of the subexpression. We're done.. Assign the new value to x which is identical to the glvalue and prvalue result of the subexpression. We're out of the woods..