Correct way to work with vector of arrays

Question

Could someone tell what is the correct way to work with a vector of arrays    I declared a vector of arrays  vector lt float 4  gt   but got error  conversion from  int  to non-scalar type  float  4   requested when trying to resize it  What is going wrong

User · Answer

There is no error in the following piece of code:

float arr[4];
arr[0] = 6.28;
arr[1] = 2.50;
arr[2] = 9.73;
arr[3] = 4.364;
std::vector<float*> vec = std::vector<float*>();
vec.push_back(arr);
float* ptr = vec.front();
for (int i = 0; i < 3; i++)
    printf("%g\n", ptr[i]);

OUTPUT IS:

6.28

2.5

9.73

4.364

IN CONCLUSION:

std::vector<double*>

is another possibility apart from

std::vector<std::array<double, 4>>

that James McNellis suggested.

User · Answer

Use   vector lt vector lt float gt  gt  vecArray    both dimensions are open

User · Answer

Every element of your vector is a float 4   so when you resize every element needs to default initialized from a float 4   I take it you tried to initialize with an int value like 0   Try   static float zeros 4     0 0  0 0  0 0  0 0   myvector resize newsize  zeros

User · Answer

You cannot store arrays in a vector or any other container   The type of the elements to be stored in a container  called the container s value type  must be both copy constructible and assignable   Arrays are neither   You can  however  use an array class template  like the one provided by Boost  TR1  and C  0x   std  vector lt std  array lt double  4 gt   gt     You ll want to replace std  array with std  tr1  array to use the template included in C   TR1  or boost  array to use the template from the Boost libraries   Alternatively  you can write your own  it s quite straightforward

[c++] Correct way to work with vector of arrays

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