C++ Create a std::vector const& object

Question

I have one vector::

static const std::vector<float> vector1

and one reference of a vector:

std::vector<float> const& vector2

I need to multiply the values of these vectors with each other and store them in a new vector.

For example:

result[0]=vector1[0]*vector2[0]
result[1]=vector1[1]*vector2[1]

Then I need to give this vector to a method which only accepts:

std::vector<float> const& result

How do I do this in C++?

that's not an address, that's a reference. You're mixing up C and C++ constructs. — Marcus Müller, Nov 14 '16 at 00:00
related: https://stackoverflow.com/questions/8511035/sequence-zip-function-for-c11#8513803 but may carry too much dependencies — WorldSEnder, Nov 14 '16 at 00:01

Igor Tandetnik · Accepted Answer · 2016-11-14T00:32:01.540

5

std::vector<float> result;
std::transform(
    vector1.begin(), vector1.end(),
    vector2.begin(),
    std::back_inserter(result), std::multiplies<float>());

CallMethodThatTakesReferenceToVector(result);

Demo

edited Nov 14 '16 at 00:32

answered Nov 14 '16 at 00:06

Igor Tandetnik

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this doesnt seem to work. I get a compiler error, that transform can not find an overloading function. StoryTellers edit works – Peter111 Nov 14 '16 at 00:26

C++ Create a std::vector const& object

1 Answers1