Weird errors

[viral acorn]

I am getting a lot of ostream errors when I compile with c++20

#include<iostream>
#include<cmath>
#include<iomanip>
#include<algorithm>
#include <string>
#include <typeinfo>
#include <functional>
#include <concepts>
#include <cmath>
#include<ostream>
using namespace std;

int constexpr inline countDigit(long long n)
{
    if (n/10 == 0)
        return 1;
    return 1 + countDigit(n / 10);
}
int constexpr inline sign(int y){
    return clamp(y,-1,1);
}
//#define sign(n) clamp(n,-1,1);
#define axis  "+ ";
#define line  "# ";
#define graph "  ";
#define size 15
template<typename T>
concept Number = integral<T> || floating_point<T>;

template<typename T,typename E,typename K>
void k(T(*h)(E,K) ) requires Number<T> && Number<E> && Number<K>{
    int z;
    for(int y=-size;y<=size;y++){
        if (y%5==0){cout<<setw(countDigit(size)+2)<<-y;}else{cout<<setw(countDigit(size)+4);}
        cout<< (y%5==0?"-|":"|");
        for(int x=-size;x<=size;x++){
            z = sign(h(x,y))+sign(h(x-1,y))+sign(h(x,y-1))+sign(h(x-1,y-1)); 
            if ((z<4) && (z>-4)){
                cout<<line;
            } else if(y==0) {
                cout<<"- ";
            } else{
                cout<<graph;
            }
        }   
    cout<<'\n';

    }
}

int constexpr inline f(int x,int y){
    return x*x*x*x*x-350*x*x*x+9999*x-6500*y;
    //return (y*y/25)-(x*x/1.5*1.5)-1;
    //return y+x*x;
    //return y-5*x;
    //return y;
    //return y-tan(x);
    }

int main(){
    
    cout<<"\n";
    k(&f);
}```
btw I am using gcc version 12.2.0 mingw

[split quail]

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[viral acorn]

the errors are:

[lunar matrix]

!f

[split quail]

I am getting a lot of ostream errors when I compile with c++20

#include <algorithm>
#include <cmath>
#include <cmath>
#include <concepts>
#include <functional>
#include <iomanip>
#include <iostream>
#include <ostream>
#include <string>
#include <typeinfo>
using namespace std;

int constexpr inline countDigit(long long n) {
  if (n / 10 == 0)
    return 1;
  return 1 + countDigit(n / 10);
}
int constexpr inline sign(int y) {
  return clamp(y, -1, 1);
}
//#define sign(n) clamp(n,-1,1);
#define axis "+ ";
#define line "# ";
#define graph "  ";
#define size 15
template<typename T>
concept Number = integral<T> || floating_point<T>;

template<typename T, typename E, typename K>
void k(T (*h)(E, K)) requires Number<T>&& Number<E>&& Number<K> {
  int z;
  for (int y = -size; y <= size; y++) {
    if (y % 5 == 0) {
      cout << setw(countDigit(size) + 2) << -y;
    } else {
      cout << setw(countDigit(size) + 4);
    }
    cout << (y % 5 == 0 ? "-|" : "|");
    for (int x = -size; x <= size; x++) {
      z = sign(h(x, y)) + sign(h(x - 1, y)) + sign(h(x, y - 1)) +
          sign(h(x - 1, y - 1));
      if ((z < 4) && (z > -4)) {
        cout << line;
      } else if (y == 0) {
        cout << "- ";
      } else {
        cout << graph;
      }
    }
    cout << '\n';
  }
}

int constexpr inline f(int x, int y) {
  return x * x * x * x * x - 350 * x * x * x + 9999 * x - 6500 * y;
  // return (y*y/25)-(x*x/1.5*1.5)-1;
  // return y+x*x;
  // return y-5*x;
  // return y;
  // return y-tan(x);
}

int main() {
  cout << "\n";
  k(&f);
}

btw I am using gcc version 12.2.0 mingw

ThePlatypusEveryoneLoves

Formatted by Raynei

[lunar matrix]

also it seems to work fine on "my machine"

https://godbolt.org/z/xT5cqavoo

you're using gcc instead of g++ so maybe that's something

[viral acorn]

only wierd when i run it on my system

works fine online

[granite escarp]

the error is indeed that you use gcc instead of g++

for C++ code you need to use g++ as that invokes the linker et al. with different default options than gcc

also, these macros

#define axis "+ ";
#define line "# ";
#define graph "  ";
#define size 15

are kinda cursed

why not just make them constexpr variables?

[alpine lava]

oh this is so cursed, just FYI @viral acorn
if you call

std::vector<int> test;
test.size();

you are in for a good time :)

[viral acorn]

Whats supposed to happen

[alpine lava]

What do you think that happens? What do defines do?

[viral acorn]

Is basicly the compiler doing control-f replace
🙃

[alpine lava]

yup

and what happens when things like member functions are called .size :D

it just gets replaced

[viral acorn]

Whats the vector for

[viral acorn]

Wait... What?

[alpine lava]

It's just an example here. Vector has an .size() methode what would be replaced with .15() what is obviously garbage

Hence why defines are bad

[viral acorn]

Ohhh thats what you meant...

I thought you said vector.size was a define

[viral acorn]

!solved