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// PR c++/24745 : warnings for NULL constant.

// { dg-do compile  }

// { dg-options "-Wpointer-arith -Wconversion " }

#include 

int foo (void)

{

  if (NULL == 1) return -1;   // { dg-warning "NULL used in arithmetic" }

  if (NULL > NULL) return -1; // { dg-warning "NULL used in arithmetic" }

  if (NULL < NULL) return -1; // { dg-warning "NULL used in arithmetic" }

  if (NULL >= 0) return -1;   // { dg-warning "NULL used in arithmetic" }

  if (NULL <= 0) return -1;   // { dg-warning "NULL used in arithmetic" }

  // Adding to the NULL pointer, which has no specific type, should

  // result in a warning; the type of the resulting expression is

  // actually "int", not a pointer type.

  if (NULL + 1) return -1;    // { dg-warning "NULL used in arithmetic" }

  if (1 + NULL) return -1;    // { dg-warning "NULL used in arithmetic" }

  return 0;

}

int *ip;

struct S {};

typedef int S::*SPD;

typedef void (S::*SPF)(void);

SPD spd;

SPF spf;

int bar (void)

{

  if (NULL) return -1;

  if (!NULL) return -1;

  if (!NULL == 1) return -1;

  if (NULL || NULL) return -1;

  if (!NULL && NULL) return -1;

  if (NULL == NULL) return -1;

  if (NULL != NULL) return -1;

  if (NULL == 0) return -1;

  if (NULL != 0) return -1;

  // Subtraction of pointers is vaild, so using NULL is OK.

  if (ip - NULL) return -1;

  if (NULL - NULL) return -1;

  // Comparing NULL with a pointer-to-member is OK.

  if (NULL == spd) return -1;

  if (spd == NULL) return -1;

  if (NULL != spd) return -1;

  if (spd != NULL) return -1;

  if (NULL == spf) return -1;

  if (spf == NULL) return -1;

  if (NULL != spf) return -1;

  if (spf != NULL) return -1;

  return 0;

}