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concise and useful macro to find number of elements in an array.
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concise and useful macro to find number of elements in an array.

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<pre><code id="code-10-28269740-1"> ParameterDef const  Parameters : : Info[ ] =
{
{ParameterId_Vendor,                                           0,       2,       0,  false,  null}, 
{ParameterId_SystemOverview,                          1,       2,       1,  false,  null}, 
.....</code></pre>
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We have large array of structures. &nbsp;In our code, sizeof operator is used to find number of elements in the array as follows:<br />
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sizeof (Parameters : : Info) / sizeof ( * Parameters : : Info )<br />
&nbsp;<br />
* Parameters : : Info &nbsp; &nbsp;// is this the size of first element of the array ?<br />
<br />
Would the following be equivalent:<br />
<br />
sizeof (Parameters : : Info) / sizeof ( Parameters : : Info [ 0 ] )
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We have large array of structures.  In our code, sizeof operator is used to find number of elements in the array as follows:

sizeof (Parameters : : Info) / sizeof ( * Parameters : : Info )
 
* Parameters : : Info    // is this the size of first element of the array ?

Would the following be equivalent:

sizeof (Parameters : : Info) / sizeof ( Parameters : : Info [ 0 ] )

How to use sizeof operator to calculate number of elements in array of structures ?

C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.