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Top Forums Programming sizeof an array of structure without using 'sizeof' operator Post 302302234 by rvan on Monday 30th of March 2009 12:17:35 PM
Old 03-30-2009
Thank you pshaikh. it exactly gives the sizeof the structure. While executing your first sample piece of code... it is mostly &begin is greater than &end. Here all the local variables begin, end and array[100] gets stored in the stack. When you subtract the begin address and end address and divide it by the sizeof the array it gives the sizeof structure.

But if i try to subtract address of say &array[1] - &array[0] doesn't give the sizeof the array instead it gives 1 always. I just tried printing &array[1] and &array[0] which gives the address. When we subtract the address of begin and end variable it gives the number of bytes occupied between those two and why not in &array[1] - &array[0]. Kindly clarify.


Thanks
 

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std::indirect_array< _Tp >(3)				     Library Functions Manual				     std::indirect_array< _Tp >(3)

NAME
std::indirect_array< _Tp > - SYNOPSIS
Public Types typedef _Tp value_type Public Member Functions indirect_array (const indirect_array &) void operator%= (const valarray< _Tp > &) const template<class _Dom > void operator%= (const _Expr< _Dom, _Tp > &) const void operator&= (const valarray< _Tp > &) const template<class _Dom > void operator&= (const _Expr< _Dom, _Tp > &) const void operator*= (const valarray< _Tp > &) const template<class _Dom > void operator*= (const _Expr< _Dom, _Tp > &) const void operator+= (const valarray< _Tp > &) const template<class _Dom > void operator+= (const _Expr< _Dom, _Tp > &) const void operator-= (const valarray< _Tp > &) const template<class _Dom > void operator-= (const _Expr< _Dom, _Tp > &) const void operator/= (const valarray< _Tp > &) const template<class _Dom > void operator/= (const _Expr< _Dom, _Tp > &) const void operator<<= (const valarray< _Tp > &) const template<class _Dom > void operator<<= (const _Expr< _Dom, _Tp > &) const indirect_array & operator= (const indirect_array &) void operator= (const valarray< _Tp > &) const void operator= (const _Tp &) const template<class _Dom > void operator= (const _Expr< _Dom, _Tp > &) const void operator>>= (const valarray< _Tp > &) const template<class _Dom > void operator>>= (const _Expr< _Dom, _Tp > &) const void operator^= (const valarray< _Tp > &) const template<class _Dom > void operator^= (const _Expr< _Dom, _Tp > &) const void operator|= (const valarray< _Tp > &) const template<class _Dom > void operator|= (const _Expr< _Dom, _Tp > &) const Friends class gslice_array< _Tp > class valarray< _Tp > Detailed Description template<class _Tp>class std::indirect_array< _Tp > Reference to arbitrary subset of an array. An indirect_array is a reference to the actual elements of an array specified by an ordered array of indices. The way to get an indirect_array is to call operator[](valarray<size_t>) on a valarray. The returned indirect_array then permits carrying operations out on the referenced subset of elements in the original valarray. For example, if an indirect_array is obtained using the array (4,2,0) as an argument, and then assigned to an array containing (1,2,3), then the underlying array will have array[0]==3, array[2]==2, and array[4]==1. Parameters: Tp Element type. Definition at line 84 of file valarray. Author Generated automatically by Doxygen for libstdc++ from the source code. libstdc++ Tue Jun 10 2014 std::indirect_array< _Tp >(3)
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