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Purpose of returning by const value? [duplicate]
...tion on an object, returning by const-value prevents you from accidentally calling this operation on a temporary. Imagine that + returned a non-const value, and you could write:
(a + b).expensive();
In the age of C++11, however, it is strongly advised to return values as non-const so that you can...
Does Java have buffer overflows?
...
Since Java Strings are based on char arrays and Java automatically checks array bounds, buffer overflows are only possible in unusual scenarios:
If you call native code via JNI
In the JVM itself (usually written in C++)
The interpreter or JIT compiler does not work correctly (Java by...
Generic type conversion FROM string
... Fallback convert options for Enums and Other Complex structures, but good call.
– Tomer W
Mar 27 '12 at 14:10
2
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Func vs. Action vs. Predicate [duplicate]
...mparisons.
Though widely used with Linq, Action and Func are concepts logically independent of Linq. C++ already contained the basic concept in form of typed function pointers.
Here is a small example for Action and Func without using Linq:
class Program
{
static void Main(string[] args)
...
Preventing console window from closing on Visual Studio C/C++ Console application
...7 (15.9.4) there is an option:
Tools->Options->Debugging->Automatically close the console
The corresponding fragment from the Visual Studio documentation:
Automatically close the console when debugging stops:
Tells Visual Studio to close the console at the end of a debugging session.
...
How to check whether a variable is a class or not?
...nd Python 3.x.
import six
isinstance(obj, six.class_types)
This is basically a wrapper function that performs the same check as in andrea_crotti answer.
Example:
>>> import datetime
>>> isinstance(datetime.date, six.class_types)
>>> True
>>> isinstance(datet...
Comparing Java enum members: == or equals()?
...
Both are technically correct. If you look at the source code for .equals(), it simply defers to ==.
I use ==, however, as that will be null safe.
share
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Convert String to Float in Swift
... {
return (self as NSString).floatValue
}
}
Now you can just call var WageConversion = Wage.text.floatValue and allow the extension to handle the bridge for you!
This is a good implementation since it can handle actual floats (input with .) and will also help prevent the user from cop...
Why a function checking if a string is empty always returns true? [closed]
...
@cletus: then consider a string $s='0'. If you call empty($s) it will evaluate to true (not intuitive imho, but it is so).
– johndodo
Oct 27 '11 at 8:26
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How to append a char to a std::string?
... It's less typing. In gcc, basic_string::operator+= is just a call in push_back.
– eduffy
Sep 24 '09 at 14:37
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