diff options
Diffstat (limited to 'src/gtest.cc')
| -rw-r--r-- | src/gtest.cc | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/src/gtest.cc b/src/gtest.cc index bb5ffacc..30652fe1 100644 --- a/src/gtest.cc +++ b/src/gtest.cc @@ -260,6 +260,25 @@ GTEST_DEFINE_bool_( namespace internal { +// Generates a random number from [0, range), using a Linear +// Congruential Generator (LCG). Crashes if 'range' is 0 or greater +// than kMaxRange. +UInt32 Random::Generate(UInt32 range) { + // These constants are the same as are used in glibc's rand(3). + state_ = (1103515245U*state_ + 12345U) % kMaxRange; + + GTEST_CHECK_(range > 0) + << "Cannot generate a number in the range [0, 0)."; + GTEST_CHECK_(range <= kMaxRange) + << "Generation of a number in [0, " << range << ") was requested, " + << "but this can only generate numbers in [0, " << kMaxRange << ")."; + + // Converting via modulus introduces a bit of downward bias, but + // it's simple, and a linear congruential generator isn't too good + // to begin with. + return state_ % range; +} + // g_help_flag is true iff the --help flag or an equivalent form is // specified on the command line. static bool g_help_flag = false; @@ -3815,7 +3834,7 @@ static void TearDownEnvironment(Environment* env) { env->TearDown(); } // considered to be failed, but the rest of the tests will still be // run. (We disable exceptions on Linux and Mac OS X, so the issue // doesn't apply there.) -// When parameterized tests are enabled, it explands and registers +// When parameterized tests are enabled, it expands and registers // parameterized tests first in RegisterParameterizedTests(). // All other functions called from RunAllTests() may safely assume that // parameterized tests are ready to be counted and run. |