LCOV - code coverage report
Current view: top level - tests - catch_log2.cpp (source / functions) Hit Total Coverage
Test: coverage.info Lines: 14 14 100.0 %
Date: 2021-08-22 18:14:51 Functions: 3 3 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : // Copyright (c) 2018-2021  Made to Order Software Corp.  All Rights Reserved
       2             : //
       3             : // https://snapwebsites.org/project/snapdev
       4             : // contact@m2osw.com
       5             : //
       6             : // This program is free software; you can redistribute it and/or modify
       7             : // it under the terms of the GNU General Public License as published by
       8             : // the Free Software Foundation; either version 2 of the License, or
       9             : // (at your option) any later version.
      10             : //
      11             : // This program is distributed in the hope that it will be useful,
      12             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14             : // GNU General Public License for more details.
      15             : //
      16             : // You should have received a copy of the GNU General Public License along
      17             : // with this program; if not, write to the Free Software Foundation, Inc.,
      18             : // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      19             : 
      20             : /** \file
      21             :  * \brief Verify that the log2() function.
      22             :  *
      23             :  * This file implements test for the log2() function.
      24             :  */
      25             : 
      26             : // self
      27             : //
      28             : #include    "catch_main.h"
      29             : 
      30             : 
      31             : 
      32             : // snapdev lib
      33             : //
      34             : #include    <snapdev/log2.h>
      35             : 
      36             : 
      37             : // last include
      38             : //
      39             : #include    <snapdev/poison.h>
      40             : 
      41             : 
      42             : 
      43             : 
      44             : 
      45             : 
      46           5 : CATCH_TEST_CASE("log2", "[math]")
      47             : {
      48           6 :     CATCH_START_SECTION("log2: zero")
      49             :     {
      50           1 :         CATCH_REQUIRE(snap::log2(0) == -1);
      51             :     }
      52             :     CATCH_END_SECTION()
      53             : 
      54           6 :     CATCH_START_SECTION("log2: powers of 2")
      55             :     {
      56          65 :         for(int i = 0; i < 64; ++i)
      57             :         {
      58          64 :             std::uint64_t const v = 1ULL << i;
      59          64 :             CATCH_REQUIRE(snap::log2(v) == i);
      60             :         }
      61             :     }
      62             :     CATCH_END_SECTION()
      63             : 
      64           6 :     CATCH_START_SECTION("log2: random numbers")
      65             :     {
      66          65 :         for(int i = 0; i < 64; ++i)
      67             :         {
      68          64 :             std::uint64_t r = (static_cast<std::uint64_t>(rand()) << 32) ^ static_cast<std::uint64_t>(rand());
      69          64 :             r &= (1ULL << i) - 1ULL;
      70          64 :             std::uint64_t const v = (1ULL << i) | r;
      71             : 
      72             :             // same difference, all the lower bits are ignored in the
      73             :             // computation
      74             :             //
      75          64 :             CATCH_REQUIRE(snap::log2(v) == i);
      76             :         }
      77             :     }
      78             :     CATCH_END_SECTION()
      79           9 : }
      80             : 
      81             : 
      82             : 
      83             : // vim: ts=4 sw=4 et

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