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How to implement the factory method pattern in C++ correctly
...e, evil? for example. So pointers are the only thing that's left, and that includes smart pointers too. In other words, factories are most useful when used with dynamic allocation, so you can do things like this:
class Abstract {
public:
virtual void do() = 0;
};
class Factory {
public:
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Creating your own header file in C
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foo.h
#ifndef FOO_H_ /* Include guard */
#define FOO_H_
int foo(int x); /* An example function declaration */
#endif // FOO_H_
foo.c
#include "foo.h" /* Include the header (not strictly necessary here) */
int foo(int x) /* Function defini...
Use of #pragma in C
...ng #pragma once at the top of your header file will ensure that it is only included once. Note that #pragma once is not standard C99, but supported by most modern compilers.
An alternative is to use include guards (e.g. #ifndef MY_FILE #define MY_FILE ... #endif /* MY_FILE */)
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Where do you include the jQuery library from? Google JSAPI? CDN?
There are a few ways to include jQuery and jQuery UI and I'm wondering what people are using?
16 Answers
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What are the differences between a multidimensional array and an array of arrays in C#?
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What's the difference between xsd:include and xsd:import?
What's the difference between xsd:include and xsd:import ? When would you use one instead of the other, and when might it not matter?
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Exporting functions from a DLL with dllexport
...u really want to do is define a conditional macro in a header that will be included in all of the source files in your DLL project:
#ifdef LIBRARY_EXPORTS
# define LIBRARY_API __declspec(dllexport)
#else
# define LIBRARY_API __declspec(dllimport)
#endif
Then on a function that you want to be ...
Iterating C++ vector from the end to the beginning
...20, you can use a std::ranges::reverse_view and a range-based for-loop:
#include<ranges>
#include<vector>
#include<iostream>
using namespace std::ranges;
std::vector<int> const vec{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
for(auto& i : views::reverse(vec)) {
std::cout &l...
static function in C
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How do you compile this? Do you use #include <helper_file.c>? I think that would make it a single translation unit then...
– Atcold
Aug 23 '16 at 1:30
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How do I convert between big-endian and little-endian values in C++?
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If you're using Visual C++ do the following: You include intrin.h and call the following functions:
For 16 bit numbers:
unsigned short _byteswap_ushort(unsigned short value);
For 32 bit numbers:
unsigned long _byteswap_ulong(unsigned long value);
For 64 bit numbers:
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