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not understandable pointers errors


not understandable pointers errors

By : Shad Ow
Date : October 17 2020, 06:10 PM
it fixes the issue I'm getting two errors and I don't know how to fix them. , You should compile with maximum warnings:
Clang
code :
$ clang -Weverything -c test.c
test.c:7:10: warning: incompatible pointer types initializing 'int *' with an expression of type 'char *' [-Wincompatible-pointer-types]
    int *sorting_pointer = &players[LENGTH-1];
         ^                 ~~~~~~~~~~~~~~~~~~
test.c:9:27: warning: comparison between pointer and integer ('int *' and 'int')
    while (sorting_pointer!=players[0])
           ~~~~~~~~~~~~~~~^ ~~~~~~~~~~
test.c:11:40: error: 'int **' and 'char *' are not pointers to compatible types
        int position=((&sorting_pointer-&players[0])/sizeof(int));
                       ~~~~~~~~~~~~~~~~^~~~~~~~~~~~
test.c:12:34: error: invalid operands to binary expression ('int *' and 'int')
        current_index=boom_number%position
                      ~~~~~~~~~~~^~~~~~~~~
$ gcc -Wall -c test.c
test.c: In function ‘play’:
test.c:7:28: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
     int *sorting_pointer = &players[LENGTH-1];
                            ^
test.c:9:27: warning: comparison between pointer and integer
     while (sorting_pointer!=players[0])
                           ^~
test.c:11:40: error: invalid operands to binary - (have ‘int **’ and ‘char *’)
         int position=((&sorting_pointer-&players[0])/sizeof(int));
                        ~~~~~~~~~~~~~~~~^~~~~~~~~~~~
test.c:12:34: error: invalid operands to binary % (have ‘int *’ and ‘int’)
         current_index=boom_number%position
                                  ^
test.c:13:9: error: expected ‘;’ before ‘char’
         char temp[]=players[current_index]
         ^~~~
test.c:8:9: warning: variable ‘current_index’ set but not used [-Wunused-but-set-variable]
     int current_index=0;
         ^~~~~~~~~~~~~
test.c:6:10: warning: unused variable ‘temp’ [-Wunused-variable]
     char temp;
          ^~~~
test.c:5:9: warning: unused variable ‘y’ [-Wunused-variable]
     int y;
void play(int *boom_number, char *players)
{
    ...
    int *sorting_pointer = &players[LENGTH - 1];
    int position = ((&sorting_pointer - &players[0]) / sizeof(int));
    ...
}
void play(int *boom_number, char *players)
{
    ...
    char *sorting_pointer = &players[LENGTH - 1];
    size_t length = sorting_pointer - &players[0];
    ...
}


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Errors with Pointers

Errors with Pointers


By : Med Doubad
Date : March 29 2020, 07:55 AM
Any of those help I have been working on a simple binary search tree for a larger project. I understand the concept of a binary search tree and am simply having troubles with syntax of implementing in C++. I am deliberately not using boost's tree containers. My code for the tree is as follows. , You have to allocate Tree(s) on the heap.
code :
Tree node = Tree(value);
Tree *node = new Tree(value);
parent.nodeChild2 = node;
void Tree::crawl(const Tree &parent){
  cout<<parent.nodeValue<<endl;
  if(NULL!=parent.nodeChild1){
      crawl(*parent.nodeChild1);
  }
  if(NULL!=parent.nodeChild2){
      crawl(*parent.nodeChild2);
  }
}
static Tree findValue(const Tree &parent, int value);
errors with a map of pointers to vectors of pointers

errors with a map of pointers to vectors of pointers


By : Christopher Sun
Date : March 29 2020, 07:55 AM
it fixes the issue Using operator[] on the map with a nonexistent key will indeed insert a new shared_ptr. However, what you aren't taking into account is that the new shared_ptr will be empty (i.e. a null pointer), and therefore dereferencing it will cause undefined behavior. A new vector will not be created - since you are using pointers to vectors, you'll need to allocate a new vector yourself.
If your map's value type was the vector itself rather than a pointer to it, it would be created automatically as you expect.
Convert user understandable date time format string to strptime understandable format string

Convert user understandable date time format string to strptime understandable format string


By : Kev Berot
Date : March 29 2020, 07:55 AM
hop of those help? You may extend replacements to cover all possible user date time formats (you may also edit this answer to include them here)
code :
import re

replacements = {
    r'dd': '%d',
    r'd': '%d',
    r'MM': '%m',
    r'M': '%m',
    r'yyyy': '%Y',
    r'HH': '%H',
    r'mm': '%M',
    r'MMM': '%b',
    r'yy': '%Y',
}

def fn(match):
    return replacements[match.group()]

def F(text):
    pat = '|'.join(r'\b' + re.escape(k) + r'\b' for k in replacements)
    return re.sub(pat, fn, text)

>>> F("dd/MM/yyyy")
'%d/%m/%Y'
>>> F("HH:mm")
'%H:%M'
>>> F("dd-MMM-yy")
'%d-%b-%Y'
>>> F("M/d/yyyy")
'%m/%d/%Y'
Angular Js Errors are not understandable

Angular Js Errors are not understandable


By : solarshakti
Date : March 29 2020, 07:55 AM
wish helps you In addition to the actual error explained by @dave, if you want eror messages to be more explicit without having to follow a link, you should use angular.js instead of angular.min.js (the minimized one) for your development environment.
Mis-setting django's ALLOWED_HOSTS setting does not give understandable errors

Mis-setting django's ALLOWED_HOSTS setting does not give understandable errors


By : Michelle
Date : March 29 2020, 07:55 AM
like below fixes the issue Django's ALLOWED_HOSTS setting, if set to a different host than the browser is connecting to, simply causes a 400, with no indication of the problem. , Yes, Django error logs.
code :
[ERROR] [2014-10-23 12:46:06,073] [base 6808 140062533326784] [Invalid HTTP_HOST header: 'whatver.host'.You may need to add u'whatever_host' to ALLOWED_HOSTS.]
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'error_file': {
            'level': 'ERROR',
            'filename': os.path.join(LOG_PATH, 'error.log'),
            'class':'logging.handlers.RotatingFileHandler',
            'maxBytes': 1 * 1024 * 1024,
            'backupCount': 2
        }
    },
    'loggers': {
        'django': {
            'handlers': ['error_file'],
            'level': 'ERROR',
            'propagate': True
        }
    }
}
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