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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2025 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Window/Event.hpp>
#include <SFML/Window/WindowBase.hpp> // NOLINT(misc-header-include-cycle)
#include <type_traits>
#include <utility>
namespace sf
{
namespace priv
{
template <typename... Ts>
struct OverloadSet : Ts...
{
using Ts::operator()...;
#if defined(_MSC_VER) && !defined(__clang__)
unsigned char dummy; // Dummy variable to ensure that this struct is not empty thus avoiding a crash due to an MSVC bug
#endif
};
template <typename... Ts>
OverloadSet(Ts...) -> OverloadSet<Ts...>;
struct DelayOverloadResolution
{
template <typename T>
DelayOverloadResolution(const T&)
{
}
};
// Wrapper providing a callable type suitable as OverloadSet base type for different kinds of handlers.
// By default, we derive from the handler type and inherit its call operators.
template <typename Handler>
struct Caller : Handler
{
using Handler::operator();
};
// Inheritance is not possible with reference types.
// In this case, we capture the reference and forward arguments to it.
template <typename Handler>
struct Caller<Handler&>
{
// Use SFINAE so that the call operator exists only for arguments the captured handler accepts
template <typename Argument, std::enable_if_t<std::is_invocable_v<Handler&, Argument>, int> = 0>
decltype(auto) operator()(Argument&& argument)
{
return handler(std::forward<Argument>(argument));
}
Handler& handler;
};
// Inheritance is not possible with function pointers either.
// In this case, we capture the function pointer to call it.
template <typename Return, typename Argument>
struct Caller<Return (*)(Argument)>
{
Return operator()(Argument&& argument)
{
return function(std::forward<Argument>(argument));
}
Return (*function)(Argument);
};
} // namespace priv
////////////////////////////////////////////////////////////
template <typename... Handlers>
void WindowBase::handleEvents(Handlers&&... handlers)
{
static_assert(sizeof...(Handlers) > 0, "Must provide at least one handler");
static_assert((Event::isEventHandler<Handlers> && ...), "Handlers must accept at least one subtype of sf::Event");
// Disable misc-const-correctness for this line since clang-tidy
// complains about it even though the code would become incorrect
// NOLINTNEXTLINE(misc-const-correctness)
priv::OverloadSet overloadSet{priv::Caller<Handlers>{std::forward<Handlers>(handlers)}...,
[](const priv::DelayOverloadResolution&) { /* ignore */ }};
while (const std::optional event = pollEvent())
event->visit(overloadSet);
}
} // namespace sf
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