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Difference of keywords 'typename' and 'class' in templates?
...above -- it is not interchangeable with typename in this case (note: since C++17 both keywords are allowed in this case).
You also must use class when explicitly instantiating a template:
template class Foo<int>;
I'm sure that there are other cases that I've missed, but the bottom line is:...
How to append text to a text file in C++?
How to append text to a text file in C++? And create a new text file if it does not already exist and append text to it if it does exist.
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String literals: Where do they go?
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There is no one answer to this. The C and C++ standards just say that string literals have static storage duration, any attempt at modifying them gives undefined behavior, and multiple string literals with the same contents may or may not share the same storage.
Dep...
Capture characters from standard input without waiting for enter to be pressed
...mber how I do this because it comes up so infrequently for me. But in C or C++, what is the best way to read a character from standard input without waiting for a newline (press enter).
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Logical XOR operator in C++?
...oesn't necessarily do what you might want for non-booleans. And as this is C++, there exists a real bool type instead of having to use int for that purpose.
– Greg Hewgill
Oct 20 '09 at 21:19
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What does the caret (‘^’) mean in C++/CLI?
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This is C++/CLI and the caret is the managed equivalent of a * (pointer) which in C++/CLI terminology is called a 'handle' to a 'reference type' (since you can still have unmanaged pointers).
(Thanks to Aardvark for pointing out the...
Generate colors between red and green for a power meter?
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The accepted answer didn't even really answer the question...
C++
Here's a simple C++ code segment from my engine that linearly and efficiently interpolates between three arbitrary colors:
const MATH::FLOAT4 color1(0.0f, 1.0f, 0.0f, 1.0f); // Green
const MATH::FLOAT4 color2(1.0f, 1.0...
Why is there an injected class name?
Recently, I saw a strange C++ feature: injected class name .
1 Answer
1
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Designing function f(f(n)) == -n
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Thanks to overloading in C++:
double f(int var)
{
return double(var);
}
int f(double var)
{
return -int(var);
}
int main(){
int n(42);
std::cout<<f(f(n));
}
shar...
How to disallow temporaries
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@didierc no, Foo::Foo("hi") is disallowed in C++.
– Johannes Schaub - litb
Oct 31 '12 at 22:42
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