LCOV - code coverage report
Current view: top level - common - min_non_zero.h (source / functions) Hit Total Coverage
Test: Test Coverage for xapian-core c2b6f1024d3a Lines: 2 2 100.0 %
Date: 2019-05-16 09:13:18 Functions: 1 1 100.0 %
Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /** @file min_non_zero.h
       2                 :            :  * @brief Return the smaller of two numbers which isn't zero.
       3                 :            :  */
       4                 :            : /* Copyright (C) 2018 Olly Betts
       5                 :            :  *
       6                 :            :  * Permission is hereby granted, free of charge, to any person obtaining a copy
       7                 :            :  * of this software and associated documentation files (the "Software"), to
       8                 :            :  * deal in the Software without restriction, including without limitation the
       9                 :            :  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
      10                 :            :  * sell copies of the Software, and to permit persons to whom the Software is
      11                 :            :  * furnished to do so, subject to the following conditions:
      12                 :            :  *
      13                 :            :  * The above copyright notice and this permission notice shall be included in
      14                 :            :  * all copies or substantial portions of the Software.
      15                 :            :  *
      16                 :            :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      17                 :            :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      18                 :            :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
      19                 :            :  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      20                 :            :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      21                 :            :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
      22                 :            :  * IN THE SOFTWARE.
      23                 :            :  */
      24                 :            : 
      25                 :            : #ifndef XAPIAN_INCLUDED_MIN_NON_ZERO_H
      26                 :            : #define XAPIAN_INCLUDED_MIN_NON_ZERO_H
      27                 :            : 
      28                 :            : #include <algorithm>
      29                 :            : 
      30                 :            : /** Return the smaller of two unsigned integers which isn't zero.
      31                 :            :  *
      32                 :            :  *  If both a and b are zero, returns zero.
      33                 :            :  */
      34                 :            : template<typename T>
      35                 :            : constexpr typename std::enable_if<std::is_unsigned<T>::value, T>::type
      36                 :   63400742 : min_non_zero(const T& a, const T& b)
      37                 :            : {
      38                 :            :     // To achieve the effect we want, we find the *maximum* after negating each
      39                 :            :     // of the values (which for an unsigned type leaves 0 alone but flips the
      40                 :            :     // order of all other values), then negate the answer.
      41                 :   63400742 :     return -std::max(-a, -b);
      42                 :            : }
      43                 :            : 
      44                 :            : #endif // XAPIAN_INCLUDED_MIN_NON_ZERO_H

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