General abs tests

[zoecarver]

Summary

Why?

1. Because there was a lack of abs tests
2. Because these tests make it very clear what abs declarations are where

[MaskRay]

test/std/numerics/numerics.abs/abs_tests.h

11

mixed tabs and spaces?

[zoecarver]

test/std/numerics/numerics.abs/abs_tests.h

11

Arg. The fallout of switching editors (I blame BBEdit). I will fix.

test/std/numerics/numerics.abs/abs_tests.h

+#include <test_macros.h>
+#include <cassert>
+
+template<class In, class Out> 
+void general_test(Out f(In))
+{
+    for (In i = -50; i < 50; ++i)
+    {
+        auto res = f(i);
+        ASSERT_SAME_TYPE(decltype(res), Out);
+    if (i > 0)
+      assert(res == i);
+    else
+      assert(res == i - (i * 2));
+    }
+}

test/std/numerics/numerics.abs/cinttypes.pass.cpp

+#include "abs_tests.h"
+
+#include <cinttypes>
+
+int main()
+{
+    // general_test<std::intmax_t, std::intmax_t>(std::abs);
+    general_test<std::intmax_t, std::intmax_t>(std::imaxabs);
+}

test/std/numerics/numerics.abs/cmath.pass.cpp

+#include "abs_tests.h"
+
+#include <cmath>
+
+int main()
+{
+    general_test<float,             float>(std::abs);    
+    general_test<float,             float>(std::fabs);
+    general_test<float,             float>(std::fabsf);
+    general_test<double,           double>(std::fabs);
+    general_test<long double, long double>(std::fabs);
+    general_test<long double, long double>(std::fabsl);
+}

test/std/numerics/numerics.abs/cstdlib.pass.cpp

+#include "abs_tests.h"
+
+#include <cstdlib>
+    
+int main()
+{
+    general_test<int,             int>(std::abs);
+    general_test<long,           long>(std::abs);
+    general_test<long long, long long>(std::abs);
+
+    general_test<long,           long>(std::labs);
+    general_test<long long, long long>(std::llabs);
+}
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test/std/numerics/numerics.abs/stdlib.h.pass.cpp

+#include "abs_tests.h"
+
+#include <stdlib.h>
+
+int main()
+{
+    general_test<long,           long>(abs);
+    general_test<long long, long long>(abs);
+}
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