December 11th, 2017

Coroutines mean that the thing that looks like a stack variable may not technically be one

Raymond Chen
Raymond Chen

Some time ago, I pointed out the Get­Current­Thread­Stack­Limits function which lets you determine whether a pointer points into the stack.

Note, however, that if the local variable is captured by a coroutine, The introduction of coroutines into the C++ language means that what looks like a local variable may end up being hoisted into a heap-allocated object representing the coroutine itself (like, say, a std::future).

Something to bear in mind if you’re going to be making decisions based on whether a variable is on the stack.

Category
Old New Thing
Topics
Code

Author

Raymond Chen

Raymond has been involved in the evolution of Windows for more than 30 years. In 2003, he began a Web site known as The Old New Thing which has grown in popularity far beyond his wildest imagination, a development which still gives him the heebie-jeebies. The Web site spawned a book, coincidentally also titled The Old New Thing (Addison Wesley 2007). He occasionally appears on the Windows Dev Docs Twitter account to tell stories which convey no useful information.

0 comments

Discussion are closed.

Read next