Can we implement a max or min macro, which can take variable arguments (more than two parameters )

Question

I want to implement a new max/min macro, which can take more than two parameter, for example: ``` #define max( ... ) ... ``` and then, I can use it like this: ``` max( p0, p1, p2, p3 ) max( 2, 4, 100 ) max( 1,2,3,4,5,6,7 ) -> 7 ``` if this macro can help us to implement that macro? ``` #define PP_EXPAND(X) X #define PP_ARG_COUNT(...) PP_EXPAND(PP_ARG_POPER(__VA_ARGS__, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)) #define PP_ARG_POPER(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, N, ...) N #define PP_ARG_AT(Index, ...) PP_ARG_AT_##Index(__VA_ARGS__) #define PP_ARG_AT_0(...) PP_EXPAND(PP_ARG_POPER(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, __VA_ARGS__)) #define PP_ARG_AT_1(...) PP_EXPAND(PP_ARG_POPER(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, __VA_ARGS__)) #define PP_ARG_AT_2(...) PP_EXPAND(PP_ARG_POPER(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, __VA_ARGS__)) #define PP_ARG_AT_3(.…

Accepted Answer

In C++11, `std::max` works with `initializer_list`, so you may use

```
std::max({40, 31, 42, 13, 4, 25, 16, 27});
```

And if you really want `MAX(p1, p2, p3)` syntax, you may do:

```
#define MAX(...) std::max({__VA_ARGS__})
```

Can we implement a max or min macro, which can take variable arguments (more than two parameters )

Solution

Problem