大约有 10,900 项符合查询结果（耗时：0.0372秒） [XML]
Django set default form values
...
You can use initial which is explained here
You have two options either populate the value when calling form constructor:
form = JournalForm(initial={'tank': 123})
or set the value in the form definition:
tank = forms.Intege...
What's the status of multicore programming in Haskell?
...oned in an article in the Economist magazine, Jun 2nd 2011.
Parallel tree scans via composition, an article by Conal Elliott
Numeric Haskell, a tutorial on parallel array programming with Repa, released
Works has begun on extending GHC eventlog and Threadscope to support multi-process or distributed...
What is javax.inject.Named annotation supposed to be used for?
...xWaitTime. It's just a little cleaner.
– sourcedelica
Mar 24 '11 at 13:07
28
Nice article about...
How to get std::vector pointer to the raw data?
...the iterator returned by begin() (as the compiler warns, this is not technically allowed because something.begin() is an rvalue expression, so its address cannot be taken).
Assuming the container has at least one element in it, you need to get the address of the initial element of the container, wh...
Accessing member of base class
...ic name in the constructor definition does this for you.
You don't need to call super(name) from the specialised classes.
Using this.name works.
Notes on use of super.
This is covered in more detail in section 4.9.2 of the language specification.
The behaviour of the classes inheriting from Anim...
Mongoose query where value is not null
... is exactly what I was looking for myself, thanks!
– Cacoon
Jan 30 '18 at 10:03
I was struggling to find $not in the a...
Why is conversion from string constant to 'char*' valid in C but invalid in C++
...
Up through C++03, your first example was valid, but used a deprecated implicit conversion--a string literal should be treated as being of type char const *, since you can't modify its contents (without causing undefined behavior).
As of C++11, the implicit conversion that had been deprec...
C#: How to convert a list of objects to a list of a single property of that object?
...
Thanks. Also, how would I sort that alphabetically by firstname?
– User
Sep 22 '09 at 16:36
...
C++ where to initialize static const
...y a .cpp file) would do:
foo.h
class foo {
static const string s; // Can never be initialized here.
static const char* cs; // Same with C strings.
static const int i = 3; // Integral types can be initialized here (*)...
static const int j; // ... OR in cpp.
};
foo.cpp
#incl...
Boolean vs tinyint(1) for boolean values in MySQL
...answer the question. While it's true that tinyint(1) is functionally identical to bool, the OP asked what is best to use. The answer by @dj_segfault does a proper job explaining why bool should be preferred over tinyint(1) when storing a boolean value.
– Kyle Morgan
...