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/*
==============================================================================
This file is part of the JUCE framework.
Copyright (c) Raw Material Software Limited
JUCE is an open source framework subject to commercial or open source
licensing.
By downloading, installing, or using the JUCE framework, or combining the
JUCE framework with any other source code, object code, content or any other
copyrightable work, you agree to the terms of the JUCE End User Licence
Agreement, and all incorporated terms including the JUCE Privacy Policy and
the JUCE Website Terms of Service, as applicable, which will bind you. If you
do not agree to the terms of these agreements, we will not license the JUCE
framework to you, and you must discontinue the installation or download
process and cease use of the JUCE framework.
JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
JUCE Privacy Policy: https://juce.com/juce-privacy-policy
JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
Or:
You may also use this code under the terms of the AGPLv3:
https://www.gnu.org/licenses/agpl-3.0.en.html
THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
==============================================================================
*/
namespace juce
{
/** @cond */
namespace detail
{
template <typename...>
using Void = void;
template <typename, typename = void>
constexpr auto equalityComparableToNullptr = false;
template <typename T>
constexpr auto equalityComparableToNullptr<T, Void<decltype (std::declval<T>() != nullptr)>> = true;
} // namespace detail
/** @endcond */
//==============================================================================
/** Some helper methods for checking a callable object before invoking with
the specified arguments.
If the object provides a comparison operator for nullptr it will check before
calling. For other objects it will just invoke the function call operator.
@tags{Core}
*/
struct NullCheckedInvocation
{
template <typename Callable, typename... Args>
static void invoke (Callable&& fn, Args&&... args)
{
if constexpr (detail::equalityComparableToNullptr<Callable>)
{
JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Waddress")
if (fn != nullptr)
fn (std::forward<Args> (args)...);
JUCE_END_IGNORE_WARNINGS_GCC_LIKE
}
else
{
fn (std::forward<Args> (args)...);
}
}
template <typename... Args>
static void invoke (std::nullptr_t, Args&&...) {}
};
/** Can be used to disable template constructors that would otherwise cause ambiguity with
compiler-generated copy and move constructors.
Adapted from https://ericniebler.com/2013/08/07/universal-references-and-the-copy-constructo/
*/
template <typename A, typename B>
using DisableIfSameOrDerived = std::enable_if_t<! std::is_base_of_v<A, std::remove_reference_t<B>>>;
/** Copies an object, sets one of the copy's members to the specified value, and then returns the copy. */
template <typename Object, typename OtherObject, typename Member, typename Other>
[[nodiscard]] Object withMember (Object copy, Member OtherObject::* member, Other&& value)
{
copy.*member = std::forward<Other> (value);
return copy;
}
/** @cond */
namespace detail
{
template <typename Functor, typename Return, typename... Args>
static constexpr auto toFnPtr (Functor functor, Return (Functor::*) (Args...) const)
{
return static_cast<Return (*) (Args...)> (functor);
}
} // namespace detail
/** @endcond */
/** Converts a captureless lambda to its equivalent function pointer type. */
template <typename Functor>
static constexpr auto toFnPtr (Functor functor) { return detail::toFnPtr (functor, &Functor::operator()); }
} // namespace juce
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