大约有 11,400 项符合查询结果（耗时：0.0579秒） [XML]
Why can lambdas be better optimized by the compiler than plain functions?
In his book The C++ Standard Library (Second Edition) Nicolai Josuttis states that lambdas can be better optimized by the compiler than plain functions.
...
Factors in R: more than an annoyance?
One of the basic data types in R is factors. In my experience factors are basically a pain and I never use them. I always convert to characters. I feel oddly like I'm missing something.
...
How do I check if a string is a number (float)?
What is the best possible way to check if a string can be represented as a number in Python?
33 Answers
...
How do you create a dropdownlist from an enum in ASP.NET MVC?
I'm trying to use the Html.DropDownList extension method but can't figure out how to use it with an enumeration.
36 Answe...
Is “argv[0] = name-of-executable” an accepted standard or just a common convention?
...sing argument to main() in a C or C++ application, will argv[0] always be the name of the executable? Or is this just a common convention and not guaranteed to be true 100% of the time?
...
What is the list of valid @SuppressWarnings warning names in Java?
...
Here is a list for Eclipse Galileo:
all to suppress all warnings
boxing to suppress warnings relative to boxing/unboxing operations
cast to suppress warnings relative to cast operations
dep-ann to suppress warnings relative to deprecated annotation
deprecation to suppress warnings re...
Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
...#endif
This is a preprocessor technique of preventing a header file from being included multiple times, which can be problematic for various reasons. During compilation of your project, each .cpp file (usually) is compiled. In simple terms, this means the compiler will take your .cpp file, open ...
Write to UTF-8 file in Python
...
I believe the problem is that codecs.BOM_UTF8 is a byte string, not a Unicode string. I suspect the file handler is trying to guess what you really mean based on "I'm meant to be writing Unicode as UTF-8-encoded text, but you'v...
Why is Python 3.x's super() magic?
In Python 3.x, super() can be called without arguments:
1 Answer
1
...
What does the JSLint error 'body of a for in should be wrapped in an if statement' mean?
...ray. Never. Use good old for(var i = 0; i<arr.length; i++).
The reason behind this is the following: each object in JavaScript has a special field called prototype. Everything you add to that field is going to be accessible on every object of that type. Suppose you want all arrays to have a cool...