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Why do C and C++ compilers allow array lengths in function signatures when they're never enforced?
...hat looks like it should pass the array, what actually happens is that a pointer to the first element of the array is passed instead.
Since the pointer does not include any length information, the contents of your [] in the function formal parameter list are actually ignored.
The decision to allow...
Passing by reference in C
...
Because you're passing the value of the pointer to the method and then dereferencing it to get the integer that is pointed to.
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Android代码优化小技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...进点的做法是把所有多维的数据分解成1维的数组:
一组int数据要比一组Integer对象要好很多。可以得知，两组1维数组要比一个2维数组更加的有效率。同样的，这个道理可以推广至其他原始数据类型。
如果你需要实现一个数组用...
Get class name of object as string in Swift
...itializer and create new objects of a certain class
Like, for example print(String(describing: type(of: object))). Where object can be an instance variable like array, a dictionary, an Int, a NSDate, etc.
Because NSObject is the root class of most Objective-C class hierarchies, you could try to ...
Difference between private, public, and protected inheritance
...f: public, protected and private.
Let:
class Base {
public:
int publicMember;
protected:
int protectedMember;
private:
int privateMember;
};
Everything that is aware of Base is also aware that Base contains publicMember.
Only the children (and their children...
What are the best practices for using a GUID as a primary key, specifically regarding performance?
...ably identifies every row in your table. This can be anything, really - an INT, a GUID, a string - pick what makes most sense for your scenario.
the clustering key (the column or columns that define the "clustered index" on the table) - this is a physical storage-related thing, and here, a small, st...
Declaring variables inside loops, good practice or bad practice?
...e loop to another. This typically includes the loop counter itself.
{
int i, retainValue;
for (i=0; i<N; i++)
{
int tmpValue;
/* tmpValue is uninitialized */
/* retainValue still has its previous value from previous loop */
/* Do some stuff here */
}
...
Why is (object)0 == (object)0 different from ((object)0).Equals((object)0)?
... to the static reference equality operator. There are 2 independent boxed int values created hence they are not the same reference.
In the second case you bind to the instance method Object.Equals. This is a virtual method which will filter down to Int32.Equals and this checks for a boxed integer...
What's the rationale for null terminated strings?
... pointers can do.
the core language just include minimal syntaxic sugar to convert
something between double quotes to a
bunch of chars (really a bunch of
bytes). In some cases it can be used
to initialize things completely
unrelated with text. For instance xpm
image file format is a valid C source
t...
Generate random numbers using C++11 random library
...and-Considered-Harmful
#include <random>
#include <iostream>
int main() {
std::random_device rd;
std::mt19937 mt(rd());
std::uniform_real_distribution<double> dist(1.0, 10.0);
for (int i=0; i<16; ++i)
std::cout << dist(mt) << "\n";
}
We u...