Initialize a float array on construction

Question

Is there a way in C++ to construct a float array initializing it's values?

For example, i do:

float* new_arr = new float[dimension];
for(unsigned int i = 0; i < dimension; ++i) new_arr[i] = 0;

Is it possible to do the assignment during the contruction?

none · Accepted Answer · 2012-10-02 16:19:25Z

23

float* new_arr = new float[dimension]();

answered Oct 2, 2012 at 16:19

none

12.2k10 gold badges53 silver badges87 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

bames53 Over a year ago

And with uniform initialization (C++11) you can do new float[dimension]{} or even give values: new float[dimension]{1.f,.5f,1.3f}.

Wug Over a year ago

If you are not using C++11 and want to do it, you can probably get away with declaring a static const array somewhere where you store the initial values, and memcpying it over your newly allocated arrays.

Seth Carnegie Over a year ago

@Wug not memcpy, std::copy

hmjd · Accepted Answer · 2012-10-02 16:20:56Z

11

In this particular case (all zeroes) you can use value initialization:

float* new_arr = new float[dimension]();

Instead of explicitly using new[] you could use a std::vector<float> instead:

std::vector<float> new_vec(dimension, 0);

answered Oct 2, 2012 at 16:20

hmjd

122k21 gold badges216 silver badges259 bronze badges

2 Comments

Aslan986 Over a year ago

I'm not free to use the vector template since i'm using some external lib. Thank you.

Cheers and hth. - Alf Over a year ago

@Aslan986: if the problem is some function expection a float*, then simply pass &v[0]. a std::vector has guaranteed contiguous buffer. so unless you library is like, multi-processing on graphics card with custom runtime, then just use std::vector.

Collectives™ on Stack Overflow

Initialize a float array on construction

2 Answers 2

3 Comments

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related