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3df6c383c0
Add C11's _Static_assert and static_assert macro. This is like #error, but is handled at a later stage of translation, so it is possible to check sizes of types, values of enums, etc. https://en.cppreference.com/w/c/language/_Static_assert https://port70.net/~nsz/c/c11/n1570.html#6.7.10
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*
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Copyright 2020 Google LLC
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/*
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** Tests of passing _Static_asserts.
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**/
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#include <assert.h>
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_Static_assert (1, "1 should be true.");
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_Static_assert (!0, "!0 should be true.");
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_Static_assert (1 == 1, "1 == 1 should be true.");
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_Static_assert (1 == 1L, "1 == 1L should be true.");
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_Static_assert (1 != 0, "1 != 0 should be true.");
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_Static_assert (sizeof (char) == 1, "sizeof (char) should be 1.");
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_Static_assert (sizeof (int) == 2, "sizeof (int) should be 2.");
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/* Make sure we can also do structs. */
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struct sc { char a; };
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_Static_assert (sizeof (struct sc) == 1, "sizeof (struct sc) should be 1.");
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struct si { int a; };
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_Static_assert (sizeof (struct si) == 2, "sizeof (struct si) should be 2.");
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/* Try enums. */
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enum { k = 1 };
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_Static_assert (k == 1, "k should be 1.");
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/* Just test the macro version once. */
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static_assert (1, "1 should be true.");
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/* _Static_assert can appear anywhere a declaration can. */
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void f (void)
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{
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_Static_assert (1, "1 should still be true.");
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if (1) {
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_Static_assert (1, "1 should still be true.");
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}
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}
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/* _Static_assert can also appear in structs. */
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struct S {
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int a;
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_Static_assert (1, "1 should still be true.");
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int b;
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};
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int main (void)
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{
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return 0;
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}
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