44 lines
1.6 KiB
C++
44 lines
1.6 KiB
C++
/*--------------------------------------------------------------------------*
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*
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* Microsoft Windows
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* Copyright (C) Microsoft Corporation, 1992 - 1999
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*
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* File: countof.h
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*
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* Contents:
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*
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* History: 12-May-98 JeffRo Created
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*
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*--------------------------------------------------------------------------*/
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#ifndef __COUNTOF_H__
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#define __COUNTOF_H__
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#pragma once
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/*-------------------------------------------------------------------*/
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/* Define a safe function that will return the count of elements */
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/* in an array. It is safe because it won't compile if the argument */
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/* is not an array, whereas the classic macro to do this: */
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/* */
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/* #define countof(a) (sizeof(a) / sizeof(a[0])) */
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/* */
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/* will compile if given a pointer, but will almost certainly not */
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/* give the expected result. */
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/* */
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/* Unfortunately, the compiler won't compile this yet. */
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/*-------------------------------------------------------------------*/
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#if _MSC_VER > 1400
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#error See if the compiler can handle the countof<T> template now.
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#endif
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#ifdef COMPILER_WONT_COMPILE_THIS
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template <typename T, size_t N>
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inline size_t countof(T (&a)[N])
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{ return N; }
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#else
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#define countof(x) (sizeof(x) / sizeof((x)[0]))
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#endif
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#endif // __COUNTOF_H__
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