Can I delete/resize a multi_array??
I recently discovered the multi_array, which was the answer to my prayers: typedef boost::multi_array<string, 2> ExpressionArrayType; ExpressionArrayType exprTable(boost::extents[extreme_row][extreme_col]); But now I need more functionality, which can be either: (1) Erase the current "exprTable" and create a new one, with different dimensions. (2) Resize the current dimensions. I have tried things like: ~exprTable; ~exprTable(); delete &exprTable; I have RTFM and Googled but still could use some guidance.... TIA, -RFH
Ramon F Herrera wrote:
I recently discovered the multi_array, which was the answer to my prayers:
typedef boost::multi_array<string, 2> ExpressionArrayType; ExpressionArrayType exprTable(boost::extents[extreme_row][extreme_col]);
But now I need more functionality, which can be either:
(1) Erase the current "exprTable" and create a new one, with different dimensions.
Do you mean different dimensionality? The dimensionality is part of the type and determined at compile time. Different dimensionality requires a different type.
(2) Resize the current dimensions.
Doesn't this explain resizing? http://www.boost.org/doc/libs/1_44_0/libs/multi_array/doc/user.html#sec_resi... Jeff
On 2/28/2011 10:53 AM, Jeff Flinn wrote:
Ramon F Herrera wrote:
I recently discovered the multi_array, which was the answer to my prayers:
typedef boost::multi_array<string, 2> ExpressionArrayType; ExpressionArrayType exprTable(boost::extents[extreme_row][extreme_col]);
But now I need more functionality, which can be either:
(1) Erase the current "exprTable" and create a new one, with different dimensions.
Do you mean different dimensionality? The dimensionality is part of the type and determined at compile time. Different dimensionality requires a different type.
(2) Resize the current dimensions.
Doesn't this explain resizing?
http://www.boost.org/doc/libs/1_44_0/libs/multi_array/doc/user.html#sec_resi...
Jeff
Thanks, Jeff! The snippet below is along the lines of what I am trying to accomplish. I read in TFM :-) that there is a destroy method (?), but I have never need those (until now). -Ramon -------------- #include <iostream> #include <string> #include <boost/bind.hpp> #include <boost/multi_array.hpp> using namespace std; typedef boost::multi_array<string, 2> ExpressionArrayType; void new_array(int rows, int cols) { ExpressionArrayType exprTable(boost::extents[rows][10-rows]); cout << "size is: " << exprTable.size() << "x" << exprTable[0].size() << endl; } int main(int argc, char *argv[]) { for (int row = 1; row < 8; row++) { new_array(row, row); } return 0; }
On 2/28/2011 11:22 AM, Ramon F Herrera wrote:
On 2/28/2011 10:53 AM, Jeff Flinn wrote:
Do you mean different dimensionality? The dimensionality is part of the type and determined at compile time. Different dimensionality requires a different type.
No. All my multi_arrays are tables of 2 dimensions. -RFH
On Feb 28, 9:28 am, Ramon F Herrera <ra...@patriot.net> wrote:
On 2/28/2011 11:22 AM, Ramon F Herrera wrote:
On 2/28/2011 10:53 AM, Jeff Flinn wrote:
Do you mean different dimensionality? The dimensionality is part of the type and determined at compile time. Different dimensionality requires a different type.
No. All my multi_arrays are tables of 2 dimensions.
you can always resize m.resize(extents[n1][n2]) the problem with that is that it won't necessarily "erase" the old data. You can erase the data manually after that. Or alternatively you can first resize to 0, 0 and then to the final size: m.resize(extents[0][0]); m.resize(extents[n1][n2]); in which case the data is always probably reallocated. Hope it is useful. Alfredo
-RFH
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