大约有 16,000 项符合查询结果（耗时：0.0341秒） [XML]
What does “%.*s” mean in printf?
...
You can use an asterisk (*) to pass the width specifier/precision to printf(), rather than hard coding it into the format string, i.e.
void f(const char *str, int str_len)
{
printf("%.*s\n", str_len, str);
}
share
...
Compare two objects in Java with possible null values
...
This is what Java internal code uses (on other compare methods):
public static boolean compare(String str1, String str2) {
return (str1 == null ? str2 == null : str1.equals(str2));
}
...
What does the thread_local mean in C++11?
...o data that is seemingly global or static storage duration (from the viewpoint of the functions using it) but in actual fact, there is one copy per thread.
It adds to the current automatic (exists during a block/function), static (exists for the program duration) and dynamic (exists on the heap bet...
Is there an easy way to create ordinals in C#?
...ly that hard to write a function to do it.
public static string AddOrdinal(int num)
{
if( num <= 0 ) return num.ToString();
switch(num % 100)
{
case 11:
case 12:
case 13:
return num + "th";
}
switch(num % 10)
{
case 1:
...
Why use prefixes on member variables in C++ classes
...e for most of the "bad rap" that prefixes get.
This notation is largely pointless in strongly typed languages e.g. in C++ "lpsz" to tell you that your string is a long pointer to a nul terminated string, when: segmented architecture is ancient history, C++ strings are by common convention pointers ...
与复制构造函数相关的错误.例如:0x77D9FCAA (ntdll.dll) (prog31.exe 中)处...
...员，没有复制构造函数出错
struct Node
{
Node(char *n="",int a = 0)
{
name = strdup(n);
strcpy(name,n);
age = a ;
}
~Node()
{
delete[] name;
}
char *name;
int age;
};
int main()
{
Node node1("Roger",20),node2(node1);
//print Roger 20 ...
In C++, what is a “namespace alias”?
... simply, the #define won't work.
namespace Mine { class MyClass { public: int i; }; }
namespace His = Mine;
namespace Yours { class Mine: public His::MyClass { void f() { i = 1; } }; }
Compiles fine. Lets you work around namespace/class name collisions.
namespace Nope { class Oops { public: int...
Regex Named Groups in Java
... groups ( http://www.regular-expressions.info/named.html ) so can anyone point me towards a third-party library that does?
...
How to check Google Play services version?
...
I found simple solution:
int v = getPackageManager().getPackageInfo(GoogleApiAvailability.GOOGLE_PLAY_SERVICES_PACKAGE, 0 ).versionCode;
But versionCode is deprecated in API 28, so you can use PackageInfoCompat:
long v = PackageInfoCompat.getLongV...
How to prevent custom views from losing state across screen orientation changes
...w.BaseSavedState class.
public class CustomView extends View {
private int stateToSave;
...
@Override
public Parcelable onSaveInstanceState() {
//begin boilerplate code that allows parent classes to save state
Parcelable superState = super.onSaveInstanceState();
SavedState s...