namespace ceph {
-namespace _backport17 {
-template <typename T, std::size_t N>
-constexpr std::size_t size(const T (&array)[N]) noexcept {
- return N;
-}
-
-/// http://en.cppreference.com/w/cpp/utility/functional/not_fn
-// this implementation uses c++14's result_of_t (above) instead of the c++17
-// invoke_result_t, and so may not behave correctly when SFINAE is required
-template <typename F>
-class not_fn_result {
- using DecayF = std::decay_t<F>;
- DecayF fn;
- public:
- explicit not_fn_result(F&& f) : fn(std::forward<F>(f)) {}
- not_fn_result(not_fn_result&& f) = default;
- not_fn_result(const not_fn_result& f) = default;
-
- template<class... Args>
- auto operator()(Args&&... args) &
- -> decltype(!std::declval<std::result_of_t<DecayF&(Args...)>>()) {
- return !fn(std::forward<Args>(args)...);
- }
- template<class... Args>
- auto operator()(Args&&... args) const&
- -> decltype(!std::declval<std::result_of_t<DecayF const&(Args...)>>()) {
- return !fn(std::forward<Args>(args)...);
- }
-
- template<class... Args>
- auto operator()(Args&&... args) &&
- -> decltype(!std::declval<std::result_of_t<DecayF(Args...)>>()) {
- return !std::move(fn)(std::forward<Args>(args)...);
- }
- template<class... Args>
- auto operator()(Args&&... args) const&&
- -> decltype(!std::declval<std::result_of_t<DecayF const(Args...)>>()) {
- return !std::move(fn)(std::forward<Args>(args)...);
- }
-};
-
-template <typename F>
-not_fn_result<F> not_fn(F&& fn) {
- return not_fn_result<F>(std::forward<F>(fn));
-}
-} // namespace _backport17
-
namespace _backport_ts {
template <class DelimT,
class CharT = char,
} // namespace _backport_ts
-using _backport17::size;
-using _backport17::not_fn;
using _backport_ts::ostream_joiner;
using _backport_ts::make_ostream_joiner;
} // namespace ceph
return orrible(std::equal_to<std::string>(), s, vals);
case TokenID::StringNotEquals:
- return orrible(ceph::not_fn(std::equal_to<std::string>()),
+ return orrible(std::not_fn(std::equal_to<std::string>()),
s, vals);
case TokenID::StringEqualsIgnoreCase:
return orrible(ci_equal_to(), s, vals);
case TokenID::StringNotEqualsIgnoreCase:
- return orrible(ceph::not_fn(ci_equal_to()), s, vals);
+ return orrible(std::not_fn(ci_equal_to()), s, vals);
case TokenID::StringLike:
return orrible(string_like(), s, vals);
case TokenID::StringNotLike:
- return orrible(ceph::not_fn(string_like()), s, vals);
+ return orrible(std::not_fn(string_like()), s, vals);
// Numeric
case TokenID::NumericEquals:
return shortible(std::equal_to<double>(), as_number, s, vals);
case TokenID::NumericNotEquals:
- return shortible(ceph::not_fn(std::equal_to<double>()),
+ return shortible(std::not_fn(std::equal_to<double>()),
as_number, s, vals);
return shortible(std::equal_to<ceph::real_time>(), as_date, s, vals);
case TokenID::DateNotEquals:
- return shortible(ceph::not_fn(std::equal_to<ceph::real_time>()),
+ return shortible(std::not_fn(std::equal_to<ceph::real_time>()),
as_date, s, vals);
case TokenID::DateLessThan:
target_link_libraries(unittest_iso_8601 ceph-common)
add_ceph_unittest(unittest_iso_8601)
-add_executable(unittest_backport_std test_backport_std.cc)
-add_ceph_unittest(unittest_backport_std)
-
add_executable(unittest_convenience test_convenience.cc)
target_link_libraries(unittest_convenience ceph-common)
add_ceph_unittest(unittest_convenience)
+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-/*
- * Ceph - scalable distributed file system
- *
- * Copyright (C) 2017 Red Hat, Inc.
- *
- * Author: Casey Bodley <cbodley@redhat.com>
- *
- * This is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License version 2.1, as published by the Free Software
- * Foundation. See file COPYING.
- *
- */
-
-#include "common/backport_std.h" // include first: tests that header is standalone
-#include <gtest/gtest.h>
-
-int int_func() { return 1; }
-bool bool_func0() { return true; }
-bool bool_func1(int a) { return true; }
-bool bool_func2(const std::string& a, int b) { return true; }
-
-// given a callable and argument list, test that the result of ceph::not_fn
-// evaluates to false as both an lvalue and rvalue
-template <typename F, typename ...Args>
-void test_not(F&& fn, Args&&... args)
-{
- auto res = ceph::not_fn(std::forward<F>(fn));
- // test res as lvalue
- EXPECT_FALSE(res(std::forward<Args>(args)...));
- // test res as rvalue
- // note: this forwards args twice, but it's okay if none are rvalues
- EXPECT_FALSE(std::move(res)(std::forward<Args>(args)...));
-}
-
-TEST(Backport14, not_fn)
-{
- // function pointers
- test_not(int_func);
- test_not(&int_func);
- test_not(bool_func0);
- test_not(&bool_func0);
- test_not(bool_func1, 5);
- test_not(bool_func2, "foo", 5);
-
- // lambdas
- auto int_lambda = [] { return 1; };
- auto bool_lambda0 = [] { return true; };
- auto bool_lambda1 = [] (int a) { return true; };
- auto bool_lambda2 = [] (const std::string& a, int b) { return true; };
-
- test_not(int_lambda);
- test_not(bool_lambda0);
- test_not(bool_lambda1, 5);
- test_not(bool_lambda2, "foo", 5);
-
- // functors
- struct int_functor {
- int operator()() { return 1; }
- };
- test_not(int_functor{});
-
- struct bool_functor {
- bool operator()() { return true; }
- bool operator()(int a) { return true; }
- bool operator()(const std::string& a, int b) { return true; }
- };
-
- test_not(bool_functor{});
- test_not(bool_functor{}, 5);
- test_not(bool_functor{}, "foo", 5);
-
- // lvalue-only overload
- struct lvalue_only_functor {
- bool operator()() & { return true; } // no overload for rvalue
- };
- auto lvalue_result = ceph::not_fn(lvalue_only_functor{});
- EXPECT_FALSE(lvalue_result());
- // should not compile:
- // EXPECT_FALSE(std::move(lvalue_result)());
-
- // rvalue-only overload
- struct rvalue_only_functor {
- bool operator()() && { return true; } // no overload for lvalue
- };
- EXPECT_FALSE(ceph::not_fn(rvalue_only_functor{})());
- auto lvalue_functor = rvalue_only_functor{};
- EXPECT_FALSE(ceph::not_fn(lvalue_functor)()); // lvalue functor, rvalue result
- // should not compile:
- // auto lvalue_result2 = ceph::not_fn(rvalue_only_functor{});
- // EXPECT_FALSE(lvalue_result2());
-}
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