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C＋＋模板的特化 - C/C++ - 清泛网 - 专注C/C++及内核技术
...点数、class类型的对象和内部链接对象（例如字符串常量"hello world!"）作为实参；它们可以是常整数（包括枚举值）或者指向外部链接对象的指针。
对外部链接对象的指针举个例子：
template <char const* name>
class MyClass {...};
e...
Can C++ code be valid in both C++03 and C++11 but do different things?
...r* s = u8"def"; // Previously "abcdef", now "def"
and
#define _x "there"
"hello "_x // Previously "hello there", now a user defined string literal
Type conversions of 0
In C++11, only literals are integer null pointer constants:
void f(void *); // #1
void f(...); // #2
template<int N> void g...
error upon assigning Layout: BoxLayout can't be shared
...e.setLayout(new BoxLayout(frame, BoxLayout.Y_AXIS));
frame.add(new JLabel("Hello World!"));
The control is actually being added to the ContentPane so it will look like it's 'shared' between the JFrame and the ContentPane
Do this instead:
JFrame frame = new JFrame();
frame.setLayout(new BoxLayout...
What's the difference between subprocess Popen and call (how can I use them)?
...t here is a rule of thumb:
call is blocking:
call('notepad.exe')
print('hello') # only executed when notepad is closed
Popen is non-blocking:
Popen('notepad.exe')
print('hello') # immediately executed
share
...
Can't use Swift classes inside Objective-C
...alling code)
SwiftClass *obj = [[SwiftClass alloc] initWithStringValue: @"Hello World!"];
[obj printValue];
NSString * str = obj.stringValue;
obj.stringValue = @"HeLLo wOrLd!!!";
Result
4. Call Objective-c class from Swift code
Objective-C class (ObjcClass.h)
#import <Foundation/Foundation.h...
How to dump a table to console?
...I usually end up using the one from Penlight:
> t = { a = { b = { c = "Hello world!", 1 }, 2, d = { 3 } } }
> require 'pl.pretty'.dump(t)
{
a = {
d = {
3
},
b = {
c = "Hello world!",
1
},
2
}
}
...
PowerMockito mock single static method and return object
...assWithStatics.class);
when(ClassWithStatics.getString()).thenReturn("Hello!");
System.out.println("String: " + ClassWithStatics.getString());
System.out.println("Int: " + ClassWithStatics.getInt());
}
}
The String-valued static method is stubbed to return "Hello!", while the int-v...
Adding a UILabel to a UIToolbar
...llowing code: UILabel* label = [[UILabel alloc] init]; label.text = @"Hello"; label.font = [UIFont systemFontOfSize:16]; [label sizeToFit]; self.barItem.customView = label;
– Brett Donald
Feb 23 '15 at 6:21
...
Difference between single and double square brackets in Bash
...e brackets. I'll illustrate why with the following example:
if [ $var == "hello" ]; then
if $var happens to be null / empty, then this is what the script sees:
if [ == "hello" ]; then
which will break your script. The solution is to either use double brackets, or always remember to put quotes ...
How to make a variadic macro (variable number of arguments)
...rgs);
printf("%s\n", str);
}
int main() {
PRINT("[%s %d, %d] Hello World", "March", 26, 2009);
return 0;
}
If the compiler does not understand variadic macros, you can also strip out PRINT with either of the following:
#define PRINT //
or
#define PRINT if(0)print
The first c...