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/GCC 7

8.3.2 @encode

GNU Objective-C supports the @encode syntax that allows you to create a type encoding from a C/Objective-C type. For example, @encode(int) is compiled by the compiler into "i".

@encode does not support type qualifiers other than const. For example, @encode(const char*) is valid and is compiled into "r*", while @encode(bycopy char *) is invalid and will cause a compilation error.

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https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gcc/_0040encode.html