CODEWITHSUNDEEP
c++
razor3x
razor3x

Reputation: 118

Correct way to define integral constant in .cpp file

I have a class source file Foo.cpp and I need to define IntVal constant only for local use by class methods.

// Option 1
const int IntVal = 5;
// Option 2
static const int IntVal = 5;
// Option 3
namespace {
        const int IntVal = 5;
}

int Foo::GetValue()
{
        return this->value + IntVal;
}

Which one is preferred?

Upvotes: 0

Views: 166

Answers (1)

mattlangford
mattlangford

Reputation: 1260

For hardcoded constants like that, I'd pretty much always go with:

static constexpr int kIntValue = 5;

If I had to bet, I'd say all of those compile to almost exactly the same code though (unless you're trying to use the number in a constexpr context) so it probably comes down to personal preference/style.

Upvotes: 1

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