The Preprocessor Iceberg Meme

Preprocessor metaprogramming knowledge obscurity chart

contributors:
JadLévesque
notfoundry
camel-cdr

Based on Blackle Mori's (@suricrasia) The Cursed Computer Iceberg Meme

Above the iceberg

On the iceberg

Below the water

__FILE__ __LINE__
__DATE__ __TIME__
Trigraph
#line
function like macros only see parentheses
__VA_OPT__C++20 and extension
#define A(x...)extension
,##__VA_ARGS__extension
#pragma _Pragma()
-P -Enot standardized
#if static_cast<bool>(-1)
preprocessing directives can't be inside of macros

Middle of the iceberg

__COUNTER__extension
prefix namespaces
stringify macros
#define CAT(a,b) CAT_(a,b) #define CAT_(a,b) a##b
__has_includeC++17
#elifdef #elifndefC2x
#embedC2x proposal
SCAN()
no more than 4095
mcpp
overloading macros based on argument count
default arguments

Bottom of the iceberg

Below the iceberg

Deep water

The abyss

SIMD/SCMD
ICE_P()C11
macro expansion can be recursiveextension
#include custom filesystem
F(x,y)y)y)y)y)
#for #endforrejected C proposal
operator overloading
tcc's magic non recursive recursive sequence iterationcompiler specific
slots
file iteration
file stackextension
file stack line accumulator