diff options
| author | Jonathan Wakely <jwakely@redhat.com> | 2022-06-23 11:58:16 +0100 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2022-07-21 09:57:25 +0100 |
| commit | 145ef5e2be28183f2b92b1f81b4d75210b524503 (patch) | |
| tree | 744e4fab092fa0a016c960ee62f634e7f3903e47 | |
| parent | 0bb30f94ace6be68bd315d03f36b24bbaec2bee7 (diff) | |
libstdc++: Simplify test by not using std::log2
This test uses std::log2 without including <cmath>, but it doesn't need
to use it at all. Just get the number of digits from numeric_limits
instead.
libstdc++-v3/ChangeLog:
* testsuite/26_numerics/random/random_device/entropy.cc: Use
numeric_limits<unsigned>::digits.
(cherry picked from commit 78fd15fd4a641cfac28ce60bf43a3e1ca309537b)
| -rw-r--r-- | libstdc++-v3/testsuite/26_numerics/random/random_device/entropy.cc | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/libstdc++-v3/testsuite/26_numerics/random/random_device/entropy.cc b/libstdc++-v3/testsuite/26_numerics/random/random_device/entropy.cc index 63b7043bf9b..9f529f5d814 100644 --- a/libstdc++-v3/testsuite/26_numerics/random/random_device/entropy.cc +++ b/libstdc++-v3/testsuite/26_numerics/random/random_device/entropy.cc @@ -1,6 +1,7 @@ // { dg-do run { target c++11 } } #include <random> +#include <limits> #include <testsuite_hooks.h> #include <testsuite_random.h> @@ -12,7 +13,7 @@ test01() VERIFY( std::random_device(token).entropy() == 0.0 ); using result_type = std::random_device::result_type; - const double max = std::log2(std::numeric_limits<result_type>::max() + 1.0); + const double max = std::numeric_limits<result_type>::digits; for (auto token : { "/dev/random", "/dev/urandom" }) if (__gnu_test::random_device_available(token)) |