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stackoverflow.com/questions/190232/can-a-recursive-function-be-inline

macro function: code is replaced for sure during preprocessing.
inline function: code may be or may not be replaced depending on the size of the function and other factors which depends on the compiler.

if we define all functions as inline, the executable size will be huge.

macro function, code is replaced, but it is just done one pass of the input file. so, only first occurence is replaced. correct me If I am wrong.

If inline function is recursive,

Only problem here is with semicolon, which can nullify potentially coming else type of statements:
gcc.gnu.org/onlinedocs/cpp/Swallowing-the-Semicolon.html#Swallowing-the-Semicolon

1. There is no such thing like recursive macro ( according to c++ standards)
2. Recursive inline functions are valid. But depends on how the compiler handle/optimize them. The compiler will either recurse for a certain depth and then consider them as normal functions. Or if the function recursion is HUGE, then the compiler might treat them as normal functions.

Please correct me if I am wrong.

1. There is no such thing like recursive macro ( according to c++ standards)
2. Recursive inline functions are valid. But depends on how the compiler handle/optimize them. The compiler will either recurse for a certain depth and then consider them as normal functions. Or if the function recursion is HUGE, then the compiler might treat them as normal functions.

Please correct me if I am wrong.

there is no recursive macro

below code throws an error"SUM object not found"

#define SUM(x) do{\
				cout<<SUM(x)<<endl;\
				}while(0)