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Improve C++14 support:

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* Make functions constexpr.
* Make functions noexcept where appropriate.
* Add test case for the above.
This commit is contained in:
jzmaddock
2017-03-28 18:57:50 +01:00
parent 13b153c657
commit a52bae3639
10 changed files with 77 additions and 61 deletions
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27
doc/gcd/math-gcd.qbk
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@ -24,9 +24,9 @@ programming problems.
class lcm_evaluator;
template < typename IntegerType >
IntegerType gcd( IntegerType const &a, IntegerType const &b );
constexpr IntegerType gcd( IntegerType const &a, IntegerType const &b );
template < typename IntegerType >
IntegerType lcm( IntegerType const &a, IntegerType const &b );
constexpr IntegerType lcm( IntegerType const &a, IntegerType const &b );
typedef ``['see-below]`` static_gcd_type;
@ -54,8 +54,9 @@ programming problems.
typedef IntegerType second_argument_type;
// Function object interface
result_type operator ()( first_argument_type const &a,
second_argument_type const &b ) const;
constexpr result_type operator ()(
first_argument_type const &a,
second_argument_type const &b ) const;
};
The boost::math::gcd_evaluator class template defines a function object
@ -70,6 +71,9 @@ the GCD function template. If a numeric type wants to customize evaluations
of its greatest common divisors, then the type should specialize on the
gcd_evaluator class template.
Note that these function objects are `constexpr` in C++14 and later only.
They are also declared `noexcept` when appropriate.
[endsect]
[section LCM Function Object]
@ -86,8 +90,9 @@ gcd_evaluator class template.
typedef IntegerType second_argument_type;
// Function object interface
result_type operator ()( first_argument_type const &a,
second_argument_type const &b ) const;
constexpr result_type operator ()(
first_argument_type const &a,
second_argument_type const &b ) const;
};
The boost::math::lcm_evaluator class template defines a function object
@ -103,6 +108,9 @@ of the LCM function template. If a numeric type wants to customize
evaluations of its least common multiples, then the type should
specialize on the lcm_evaluator class template.
Note that these function objects are constexpr in C++14 and later only.
They are also declared `noexcept` when appropriate.
[endsect]
[section:run_time Run-time GCD & LCM Determination]
@ -110,10 +118,10 @@ specialize on the lcm_evaluator class template.
[*Header: ] [@../../../../boost/math/common_factor_rt.hpp <boost/math/common_factor_rt.hpp>]
template < typename IntegerType >
IntegerType boost::math::gcd( IntegerType const &a, IntegerType const &b );
constexpr IntegerType boost::math::gcd( IntegerType const &a, IntegerType const &b );
template < typename IntegerType >
IntegerType boost::math::lcm( IntegerType const &a, IntegerType const &b );
constexpr IntegerType boost::math::lcm( IntegerType const &a, IntegerType const &b );
The boost::math::gcd function template returns the greatest common
(nonnegative) divisor of the two integers passed to it.
@ -124,6 +132,9 @@ IntegerType, which is also the return type. Internally, these function
templates use an object of the corresponding version of the
gcd_evaluator and lcm_evaluator class templates, respectively.
Note that these functions are constexpr in C++14 and later only.
They are also declared `noexcept` when appropriate.
[endsect]
[section:compile_time Compile time GCD and LCM determination]