Here are a few title options, keeping in mind the question format and the article\'s focus: Direct & Concise: * Why can we pass rvalues by const reference, but not by regular reference? * Why ar

Why is it Allowed to Pass rvalues by const Reference But Not by Normal Reference?

In C , it is permissible to pass rvalues (temporary objects) by const reference, which allows the reference to point to the temporary variable beyond its usual lifespan. However, this behavior is not permitted for regular (non-const) references.

Specifically, a const reference acts as a placeholder for the actual object it references. When it points to an rvalue, like a literal in display(5), it provides a mechanism to access and manipulate the value without creating a copy. The const modifier prevents modification of the referenced object, ensuring that the rvalue's integrity is maintained.

However, in the absence of the const modifier, a normal reference would attempt to rebind to the non-existent temporary object after its lifespan ends. This behavior is undefined and could potentially lead to unpredictable consequences or memory corruption.

The above is the detailed content of Here are a few title options, keeping in mind the question format and the article\'s focus: Direct & Concise: * Why can we pass rvalues by const reference, but not by regular reference? * Why ar. For more information, please follow other related articles on the PHP Chinese website!