[libstdc++ PATCH] C++14 constexpr min/max/minmax/min_element/max_element/minmax_element, also constexpr for 20.9.5-20.9.9, aka various library functors

[Ville Voutilainen]

On 18 December 2014 at 02:16, Ville Voutilainen
<ville.voutilainen@gmail.com> wrote:
> Currently finishing testing on Linux-x64. The only implementation change
> in this patch is the initialization of the iterator variables in
> __minmax_element,
> otherwise it's just adding constexpr.
>
> 2014-12-18  Ville Voutilainen  <ville.voutilainen@gmail.com>
>     C++14 constexpr min, max, minmax, min_element, max_element
>     and minmax_element. Also constexpr for 20.9.5-20.9.9,
>     aka various library functors.
>     * include/bits/c++config: Add _GLIBCXX14_CONSTEXPR.
>     * include/bits/algorithmfwd.h: Use it for min, max, minmax,
>     min_element and max_element.
>     * include/bits/predefined_ops.h: Use it for _Iter_less_iter and
>     _Iter_comp_iter.
>     * include/bits/stl_algo.h: Use it for minmax, __minmax_element,
>     min, max, __min_element and max_element.
>     Also initialize the iterator variables in __minmax_element.
>     * include/bits/stl_algobase.h: Use it for min and max.
>     * include/bits/stl_function.h: Use it for plus, minus,
>     multiplies, divides, modulus, negate, equal_to, not_equal_to,
>     greater, less, greater_equal, less_equal, logical_and, logical_or,
>     logical_not, bit_and, bit_or, bit_xor, bit_not, unary_negate,
>     not1, binary_negate and not2.
>     * testsuite/20_util/function_objects/constexpr.cc: New.
>     * testsuite/25_algorithms/max/constexpr.cc: Likewise.
>     * testsuite/25_algorithms/max_element/constexpr.cc: Likewise.
>     * testsuite/25_algorithms/min/constexpr.cc: Likewise.
>     * testsuite/25_algorithms/min_element/constexpr.cc: Likewise.
>     * testsuite/25_algorithms/minmax/constexpr.cc: Likewise.
>     * testsuite/25_algorithms/minmax_element/constexpr.cc: Likewise.

Oh well, slight goofs in the changelog for std_algo.h. Let's try that
one more time.

2014-12-18  Ville Voutilainen  <ville.voutilainen@gmail.com>
    C++14 constexpr min, max, minmax, min_element, max_element
    and minmax_element. Also constexpr for 20.9.5-20.9.9,
    aka various library functors.
    * include/bits/c++config: Add _GLIBCXX14_CONSTEXPR.
    * include/bits/algorithmfwd.h: Use it for min, max, minmax,
    min_element and max_element.
    * include/bits/predefined_ops.h: Use it for _Iter_less_iter and
    _Iter_comp_iter.
    * include/bits/stl_algo.h: Use it for minmax, __minmax_element,
    minmax_element, min, max, __min_element, min_element,
    __max_element and max_element.
    Also initialize the iterator variables in __minmax_element.
    * include/bits/stl_algobase.h: Use it for min and max.
    * include/bits/stl_function.h: Use it for plus, minus,
    multiplies, divides, modulus, negate, equal_to, not_equal_to,
    greater, less, greater_equal, less_equal, logical_and, logical_or,
    logical_not, bit_and, bit_or, bit_xor, bit_not, unary_negate,
    not1, binary_negate and not2.
    * testsuite/20_util/function_objects/constexpr.cc: New.
    * testsuite/25_algorithms/max/constexpr.cc: Likewise.
    * testsuite/25_algorithms/max_element/constexpr.cc: Likewise.
    * testsuite/25_algorithms/min/constexpr.cc: Likewise.
    * testsuite/25_algorithms/min_element/constexpr.cc: Likewise.
    * testsuite/25_algorithms/minmax/constexpr.cc: Likewise.
    * testsuite/25_algorithms/minmax_element/constexpr.cc: Likewise.