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How to convert a double to long without casting?
What is the best way to convert a double to a long without casting?
9 Answers
9
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error: cannot dynamic_cast ‘b’ (of type ‘class Base*’) to type ‘c...
error: cannot dynamic_cast ‘b’ (of type ‘class Base*’) to type ‘class Derived*’ (source type is not polymorphic)在将父类型转换为子类型时,可以使用static_cast和dynamic_cast.如果使用dynamic_cast,它要求父类必须为多态的,即要求至少有一个虚函数,因此....
How do I provide custom cast support for my class?
How do I provide support for casting my class to other types? For example, if I have my own implementation of managing a byte[] , and I want to let people cast my class to a byte[] , which will just return the private member, how would I do this?
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Cast to int vs floor
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Casting to an int will truncate toward zero. floor() will truncate toward negative infinite. This will give you different values if bar were negative.
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How to make the division of 2 ints produce a float instead of another int?
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Just cast one of the two operands to a float first.
v = (float)s / t;
The cast has higher precedence than the division, so happens before the division.
The other operand will be effectively automatically cast to a float by the...
C++: How to round a double to an int? [duplicate]
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add 0.5 before casting (if x > 0) or subtract 0.5 (if x < 0), because the compiler will always truncate.
float x = 55; // stored as 54.999999...
x = x + 0.5 - (x<0); // x is now 55.499999...
int y = (int)x; // truncated to 55
C+...
C# Float expression: strange behavior when casting the result float to int
...ating numbers a rarely exact. 6.2f is something like 6.1999998....
If you cast this to an int it will truncate it and this * 10 results in 61.
Check out Jon Skeets DoubleConverter class. With this class you can really visualize the value of a floating number as string. Double and float are both fl...
Generating a SHA-256 hash from the Linux command line
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On OSX, it might be handy to create an alias: alias sha256sum='shasum --algorithm 256'
– Jonathan Cross
Jun 4 '16 at 13:21
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How does std::forward work? [duplicate]
...does according to the standard:
§20.2.3 [forward] p2
Returns: static_cast<T&&>(t)
(Where T is the explicitly specified template parameter and t is the passed argument.)
Now remember the reference collapsing rules:
TR R
T& & -> T& // lvalue reference to c...
Create an instance of a class from a string
...re: .Unwrap() to get past the remoting handle so you can actually do the casts. @Endy - Thanks
– Roger Willcocks
Jul 20 '15 at 1:31
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