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C++17 in Detail: A Deep Dive

Why do we need attributes?

In this part we learn about attributes!

We'll cover the following...

Let’s start with an example

Have you ever used __declspec, __attribute or #pragma directives in your code?

Here is an example:

C++
// set an alignment
struct S { short f[3]; } __attribute__ ((aligned (8)));
// this function won't return
void fatal () __attribute__ ((noreturn));

Or for DLL import/export in MSVC:

C++
#if COMPILING_DLL
#define DLLEXPORT __declspec(dllexport)
#else
#define DLLEXPORT __declspec(dllimport)
#endif

Those are existing ...