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// -*- C++ -*- |
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//===-- utils.h -----------------------------------------------------------===// |
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// |
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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// See https://llvm.org/LICENSE.txt for license information. |
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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// |
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//===----------------------------------------------------------------------===// |
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|
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#ifndef _PSTL_UTILS_H |
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#define _PSTL_UTILS_H |
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|
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#include <new> |
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#include <iterator> |
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|
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namespace __pstl |
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{ |
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namespace __internal |
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{ |
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|
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template <typename _Fp> |
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typename std::result_of<_Fp()>::type |
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__except_handler(_Fp __f) |
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{ |
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try |
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{ |
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return __f(); |
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} |
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catch (const std::bad_alloc&) |
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{ |
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throw; // re-throw bad_alloc according to the standard [algorithms.parallel.exceptions] |
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} |
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catch (...) |
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{ |
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std::terminate(); // Good bye according to the standard [algorithms.parallel.exceptions] |
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} |
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} |
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|
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template <typename _Fp> |
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void |
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__invoke_if(std::true_type, _Fp __f) |
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{ |
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__f(); |
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} |
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|
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template <typename _Fp> |
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void |
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__invoke_if(std::false_type, _Fp __f) |
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{ |
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} |
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|
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template <typename _Fp> |
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void |
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__invoke_if_not(std::false_type, _Fp __f) |
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{ |
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__f(); |
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} |
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|
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template <typename _Fp> |
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void |
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__invoke_if_not(std::true_type, _Fp __f) |
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{ |
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} |
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|
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template <typename _F1, typename _F2> |
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typename std::result_of<_F1()>::type |
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__invoke_if_else(std::true_type, _F1 __f1, _F2 __f2) |
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{ |
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return __f1(); |
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} |
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|
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template <typename _F1, typename _F2> |
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typename std::result_of<_F2()>::type |
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__invoke_if_else(std::false_type, _F1 __f1, _F2 __f2) |
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{ |
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return __f2(); |
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} |
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|
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//! Unary operator that returns reference to its argument. |
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struct __no_op |
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{ |
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template <typename _Tp> |
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_Tp&& |
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operator()(_Tp&& __a) const |
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{ |
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return std::forward<_Tp>(__a); |
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} |
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}; |
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|
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//! Logical negation of a predicate |
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template <typename _Pred> |
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class __not_pred |
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{ |
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_Pred _M_pred; |
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|
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public: |
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explicit __not_pred(_Pred __pred) : _M_pred(__pred) {} |
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|
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template <typename... _Args> |
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bool |
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operator()(_Args&&... __args) |
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{ |
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return !_M_pred(std::forward<_Args>(__args)...); |
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} |
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}; |
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|
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template <typename _Pred> |
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class __reorder_pred |
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{ |
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_Pred _M_pred; |
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|
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public: |
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explicit __reorder_pred(_Pred __pred) : _M_pred(__pred) {} |
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|
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template <typename _FTp, typename _STp> |
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bool |
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operator()(_FTp&& __a, _STp&& __b) |
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{ |
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return _M_pred(std::forward<_STp>(__b), std::forward<_FTp>(__a)); |
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} |
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}; |
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|
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//! "==" comparison. |
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/** Not called "equal" to avoid (possibly unfounded) concerns about accidental invocation via |
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argument-dependent name lookup by code expecting to find the usual std::equal. */ |
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class __pstl_equal |
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{ |
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public: |
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explicit __pstl_equal() {} |
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|
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template <typename _Xp, typename _Yp> |
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bool |
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operator()(_Xp&& __x, _Yp&& __y) const |
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{ |
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return std::forward<_Xp>(__x) == std::forward<_Yp>(__y); |
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} |
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}; |
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|
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//! "<" comparison. |
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class __pstl_less |
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{ |
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public: |
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explicit __pstl_less() {} |
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|
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template <typename _Xp, typename _Yp> |
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bool |
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operator()(_Xp&& __x, _Yp&& __y) const |
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{ |
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return std::forward<_Xp>(__x) < std::forward<_Yp>(__y); |
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} |
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}; |
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|
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//! Like a polymorphic lambda for pred(...,value) |
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template <typename _Tp, typename _Predicate> |
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class __equal_value_by_pred |
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{ |
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const _Tp& _M_value; |
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_Predicate _M_pred; |
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|
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public: |
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__equal_value_by_pred(const _Tp& __value, _Predicate __pred) : _M_value(__value), _M_pred(__pred) {} |
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|
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template <typename _Arg> |
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bool |
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operator()(_Arg&& __arg) |
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{ |
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return _M_pred(std::forward<_Arg>(__arg), _M_value); |
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} |
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}; |
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|
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//! Like a polymorphic lambda for ==value |
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template <typename _Tp> |
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class __equal_value |
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{ |
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const _Tp& _M_value; |
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|
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public: |
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explicit __equal_value(const _Tp& __value) : _M_value(__value) {} |
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|
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template <typename _Arg> |
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bool |
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operator()(_Arg&& __arg) const |
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{ |
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return std::forward<_Arg>(__arg) == _M_value; |
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} |
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}; |
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|
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//! Logical negation of ==value |
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template <typename _Tp> |
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class __not_equal_value |
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{ |
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const _Tp& _M_value; |
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|
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public: |
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explicit __not_equal_value(const _Tp& __value) : _M_value(__value) {} |
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|
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template <typename _Arg> |
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bool |
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operator()(_Arg&& __arg) const |
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{ |
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return !(std::forward<_Arg>(__arg) == _M_value); |
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} |
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}; |
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|
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template <typename _ForwardIterator, typename _Compare> |
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_ForwardIterator |
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__cmp_iterators_by_values(_ForwardIterator __a, _ForwardIterator __b, _Compare __comp) |
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{ |
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if (__a < __b) |
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{ // we should return closer iterator |
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return __comp(*__b, *__a) ? __b : __a; |
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} |
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else |
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{ |
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return __comp(*__a, *__b) ? __a : __b; |
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} |
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} |
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|
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} // namespace __internal |
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} // namespace __pstl |
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|
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#endif /* _PSTL_UTILS_H */ |
