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How to use enums in C++
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Gotta love the C++ error messages...they prove that the language is to cumbersome to even give good feedback. I take it a 'primary-expression' is an object or a scope or some other thing that is NOT a type. Perhaps a Type is a 'secondary-expres...
Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
...ice, so if there are definitions within that file, you will get a compiler error telling you that you redefined a variable. When the file is processed by the preprocessor step in the compilation process, the first time its contents are reached the first two lines will check if FILE_H has been defin...
How do I remove a big file wrongly committed in git [duplicate]
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I have this error: Cannot rewrite branches: You have unstaged changes.
– capybaralet
Oct 13 '17 at 22:10
4
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ViewBag, ViewData and TempData
...uires typecasting for complex data type and check for
null values to avoid error.
ViewBag doesn’t require typecasting for complex data type.
ViewBag & ViewData Example:
public ActionResult Index()
{
ViewBag.Name = "Monjurul Habib";
return View();
}
public ActionResult Index()
{
...
Rails update_attributes without save?
..., :is_admin => true }) # Raises an ActiveModel::MassAssignmentSecurity::Error
user.assign_attributes({ :name => 'Bob'})
user.name # => "Bob"
user.is_admin? # => false
user.new_record? # => true
share...
Why use apparently meaningless do-while and if-else statements in macros?
...o() else (void)0 else { /* dangling else body */ }) triggers a compilation error. Here's a live example demonstrating it
– Chris Kline
Jul 27 '15 at 11:07
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Why does my JavaScript code receive a “No 'Access-Control-Allow-Origin' header is present on the req
...I built-in Flask . However, when I make the request, I get the following error:
9 Answers
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ImportError: No module named pip
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With macOS 10.15 and Homebrew 2.1.6 I was getting this error with Python 3.7. I just needed to run:
python3 -m ensurepip
Now python3 -m pip works for me.
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improve this ...
How to check file MIME type with javascript before upload?
...xhr.onload = function() {
callback(url, xhr.response);
};
xhr.onerror = function() {
alert('A network error occurred!');
};
xhr.send();
}
function headerCallback(url, headerString) {
printHeaderInfo(url, headerString);
}
function remoteCallback(url, blob) {
printI...
How do I change read/write mode for a file using Emacs?
... and, if it returns 0, return the output as a string.
Otherwise, signal an error. The error message is the first line of the output."
(let ((output-buffer (generate-new-buffer "*stdout*")))
(unwind-protect
(let ((return-value (apply 'call-process command nil
output-bu...