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What does the Q_OBJECT macro do? Why do all Qt objects need this macro?
...ual const QMetaObject *metaObject() const; virtual void *qt_metacast(const char *); virtual int qt_metacall(QMetaObject::Call, int, void **); static inline QString tr(const char *s, cons
t char *c = nullptr, int n = -1) { return staticMetaObject.tr(s, c, n); } __attribute__ ((__deprecated__)) static...
max value of integer
...numbers as they were unsigned (that is, handling all bits correctly).
The character data type char is 16 bits wide, unsigned, and holds characters using UTF-16 encoding (however, it is possible to assign a char an arbitrary unsigned 16 bit integer that represents an invalid character codepoint)
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What are the basic rules and idioms for operator overloading?
...oo {
public:
// Overloaded call operator
int operator()(const std::string& y) {
// ...
}
};
Usage:
foo f;
int a = f("hello");
Throughout the C++ standard library, function objects are always copied. Your own function objects should therefore be cheap to copy. If a functi...
Search all tables, all columns for a specific value SQL Server [duplicate]
I have a specific value, let's say string 'comments'. I need to find all instances of this in the database as I need to do an update on the format to change it to (*) Comments.
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Select multiple images from android gallery
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Define these variables in the class:
int PICK_IMAGE_MULTIPLE = 1;
String imageEncoded;
List<String> imagesEncodedList;
Let's Assume that onClick on a button it should open gallery to select images
Intent intent = new Intent();
intent.setType("image/*");
intent.putExtra(Inte...
How to read the content of a file to a string in C?
...you want to interpret it) to open a file in C and read its contents into a string (char*, char[], whatever)?
11 Answers
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MySQL, Check if a column exists in a table with SQL
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@Mfoo Thanks Mfoo, you saved my day! Works like charm. One of the best solutions apart from creating Procedures for this task.
– webblover
Feb 14 '14 at 17:49
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C/C++获取Windows的CPU、内存、硬盘使用率 - C/C++ - 清泛网 - 专注C/C++及内核技术
...icalDriveStrings()函数获取所有驱动器字符串信息长度。
char* DStr = new char[DSLength];//用获取的长度在堆区创建一个c风格的字符串数组
GetLogicalDriveStrings(DSLength, (LPTSTR)DStr);
//通过GetLogicalDriveStrings将字符串信息复制到堆区数...
How do I create a multiline Python string with inline variables?
I am looking for a clean way to use variables within a multiline Python string. Say I wanted to do the following:
7 Answers...
Bytes of a string in Java
In Java, if I have a String x , how can I calculate the number of bytes in that string?
8 Answers
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