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What is the purpose of the word 'self'?
...o, or perhaps something yet more different -- but it didn't. Python's all for making things explicit, making it obvious what's what, and although it doesn't do it entirely everywhere, it does do it for instance attributes. That's why assigning to an instance attribute needs to know what instance to...
How to convert a std::string to const char* or char*?
...y(str.begin(), str.end(), writable);
writable[str.size()] = '\0'; // don't forget the terminating 0
// don't forget to free the string after finished using it
delete[] writable;
Edit: Notice that the above is not exception safe. If anything between the new call and the delete call throws, you wil...
Using curl to upload POST data with files
...y send data parameters in HTTP POST but to also upload files with specific form name. How should I go about doing that ?
9 ...
How to detect if a function is called as constructor?
...k what you want is possible [prior to ES2015]. There simply isn't enough information available within the function to make a reliable inference.
Looking at the ECMAScript 3rd edition spec, the steps taken when new x() is called are essentially:
Create a new object
Assign its internal [[Prototype]...
Add Foreign Key to existing table
I want to add a Foreign Key to a table called "katalog".
13 Answers
13
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Could not locate Gemfile
...where you run that command.
Gemfile is a file containing your gem settings for a current program.
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Capture characters from standard input without waiting for enter to be pressed
I can never remember how I do this because it comes up so infrequently for me. But in C or C++, what is the best way to read a character from standard input without waiting for a newline (press enter).
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Docker: adding a file from a parent directory
...
Unfortunately, (for practical and security reasons I guess), if you want to add/copy local content, it must be located under the same root path than the Dockerfile.
From the documentation:
The <src> path must be ins...
Can I call memcpy() and memmove() with “number of bytes” set to zero?
... Where an argument declared as size_t n specifies the length of the array for a
function, n can have the value zero on a call to that function. Unless explicitly stated
otherwise in the description of a particular function in this subclause, pointer arguments
on such a call shall still have v...
Polymorphism in C++
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Understanding of / requirements for polymorphism
To understand polymorphism - as the term is used in Computing Science - it helps to start from a simple test for and definition of it. Consider:
Type1 x;
Type2 y;
f(x);
f(y);
Here, f() i...