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How to parse a string to an int in C++?
...ng.
This leads me to my second piece of advice: do no use Boost's lexical_cast for this. Consider what the lexical_cast documentation has to say:
Where a higher degree of control is
required over conversions,
std::stringstream and
std::wstringstream offer a more
appropriate path. Where
...
How do you cast a List of supertypes to a List of subtypes?
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Simply casting to List<TestB> almost works; but it doesn't work because you can't cast a generic type of one parameter to another. However, you can cast through an intermediate wildcard type and it will be allowed (since you c...
How to make the division of 2 ints produce a float instead of another int?
...
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...
uint8_t can't be printed with cout
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Since C style casts are frowned upon, wouldn't it be better to do a static_cast?
– Tim Seguine
Oct 24 '13 at 12:09
37
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How does std::move() transfer values into RValues?
...reference<T>::type&& move(T&& arg)
{
return static_cast<typename remove_reference<T>::type&&>(arg);
}
Let's start with the easier part - that is, when the function is called with rvalue:
Object a = std::move(Object());
// Object() is temporary, which ...
Why does dividing two int not yield the right value when assigned to double?
...rsion, which returns a double, at least one of the ints must be explicitly casted to a double.
c = a/(double)b;
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What happens if you static_cast invalid value to enum class?
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Answering with a quote from the C++11 and C++14 Standards:
[expr.static.cast]/10
A value of integral or enumeration type can be explicitly converted to an enumeration type. The value is unchanged if the original value is within the range of the enumeration values (7.2). Otherwise, the resulti...
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...
Cast an instance of a class to a @protocol in Objective-C
... [vc protocolMethod];
}
The UIViewController <MyProtocol> * type-cast translates to "vc is a UIViewController object that conforms to MyProtocol", whereas using id <MyProtocol> translates to "vc is an object of an unknown class that conforms to MyProtocol".
This way the compiler wil...
Enum String Name from Value
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You can convert the int back to an enumeration member with a simple cast, and then call ToString():
int value = GetValueFromDb();
var enumDisplayStatus = (EnumDisplayStatus)value;
string stringValue = enumDisplayStatus.ToString();
...