inline

问题 I have a performance critical inline function, inline T func(T a, T b, int p) . It can be optimized quite a bit, if p is known to be zero. However, I can't use an 'if' and penalize all the the other cases. What I want is to optimize the function only of I know at compile-time that p is zero. Is there a clean way to do that, maybe using template magic? EDIT I can't use differently named function/incompatible overloads (I don't know ho to express that correctly) since the code is very low level

问题 I have two models: class Actor(models.Model): name = models.CharField(max_length=30, unique = True) event = models.ManyToManyField(Event, blank=True, null=True) class Event(models.Model): name = models.CharField(max_length=30, unique = True) long_description = models.TextField(blank=True, null=True) I want to create a form that allows me to identify the link between the two models when I add a new entry. This works: class ActorForm(forms.ModelForm): class Meta: model = Actor The form includes

问题 I'm trying to convert some Haskell code to F# but I'm having some trouble since Haskell is lazy by default and F# is not. I'm also still learning my way around F#. Below is a polymorphic cosine function in Haskell with pretty good performance. I want to try and keep the same or better performance parameters in F#. I would like to see a F# List version and a F# Seq version since the Seq version would be more like the lazy Haskell but the List version would probably perform better. Thanks for

问题 I'm converting my function having lambda as parameter into inline function for performance improvement. I have list of lambda of type MutableList<(Authenticate) -> Unit> variable as data member in class. When I try to adding lambda parameter into the list . Kotlin compiler says: Illegal usage of inline parameter callback Here is the code // Some code skipped object Odoo { val pendingAuthenticateCallbacks = mutableListOf<(Authenticate) -> Unit>() inline fun authenticate( login: String,

问题 So I have two models (Tables) related by a ForeignKey. In the admin, the edit page displays the first model (let's say ModelOne) along with the related instances of the second model, ModelTwo (TabularInline). What I want is perform some additional actions when the second model is being changed. I can do this with a post_save signal on ModelTwo. However, the post_save signal is only called when I save the model from within its own edit page (ie. not within ModelOne's inlines). Is there a way

问题 When I'm creating new project with GWT plug in it creates a skeleton project for me. In html file there is a comment saying "Consider inlining CSS to reduce the number of requested files" Why would i consider using inline css? I tough having css in separate file not inline reduces size of my file? isn't it true? 回答1: The answer lies in the way that GWT operates. Since GWT only has one page load per module load the inlined caching doesn't really come into play. If you just want the answer:

问题 struct sa { struct sb { int a = 123;}; inline static sb b; }; The above code generates an error: main.cpp:25:20: error: default member initializer for ‘sa::sb::a’ required before the end of its enclosing class inline static sb b; ^ main.cpp:24:21: note: defined here struct sb { int a = 123;}; ^~~~~~ Removing the inline keyword or the default member initializer works. But just from the output, I don't understand why this usage is wrong. 回答1: I think this code is correct and should be accepted;

问题 I'm studying the behavior of the C++ linker with respect to template specializations. I'm using Microsoft Visual C++ 2010 for these experiments. I don't know if the behavior is the same with other toolchains (e.g. gcc). Here's a first code snippet: // bar.cpp template <typename T> int foo() { return 1; } int bar() { return foo<double>(); } // main.cpp template <typename T> int foo() { return 1; } template <> int foo<double>() { return 2; } int bar(); int main() { const int x = bar(); const

问题 The following code segment compiles with no problems, even though foo is defined inline but not declared as such, and bar is declared inline but not defined as such. int foo(); inline int foo() { return 3; } inline int bar(); int bar() { return 4; } inline int foobar(); inline int foobar() { return 5; } int main(){ // ... } My first question : does the compiler read foo as inline or not? What about bar ? Is this specified by the C++ standard? My second question : Which one of these is the

问题 I am trying to use inline if condition as follows: topDisplay.text = topDisplay.text!.rangeOfString(".") ? "Sth for true" : "Sth for false" The idea here is if there is "." in the topDisplay.text! then do something, if not, do something else. The method, rangeOfString, returns nil if no "." is found. So I am wondering is it possible to check nil within inline condition expression. ((btw, you might find out that I am trying to add "." button for calculator assignment in Stanford's online