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 · Accepted 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

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 lt float  gt  vec   std  vector lt float  gt     vec push back arr   float  ptr   vec front    for  int i   0  i  lt  3  i        printf   g n   ptr i      OUTPUT IS   6 28  2 5  9 73  4 364  IN CONCLUSION   std  vector lt double  gt    is another possibility apart from  std  vector lt std  array lt double  4 gt  gt    that James McNellis suggested

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

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

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

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