designated-initializer

Recently I've been working on some embedded devices, where we have some structs and unions that need to be initialized at compile time so that we can keep certain things in flash or ROM that don't need to be modified, and save a little flash or SRAM at a bit of a performance cost. Currently the code compiles as valid C99, but without this adjustment it used to compile as C++ code as well, and it would be great to support things being compiled that way as well. One of the key things that prevents this is that we're using C99 designated initializers which do not work within the C subset of C++.

static struct fuse_oprations hello_oper = { .getattr = hello_getattr, .readdir = hello_readdir, .open = hello_open, .read = hello_read, }; I don't understand this C syntax well. I can't even search because I don't know the syntax's name. What's that? This is a C99 feature that allows you to set specific fields of the struct by name in an initializer. Before this, the initializer needed to contain just the values, for all fields, in order -- which still works, of course. So for the following struct: struct demo_s { int first; int second; int third; }; ...you can use struct demo_s demo = { 1, 2,