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Added Unreachable

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Brayden Lee 2025-12-19 22:45:43 -05:00
parent 683f9160b9
commit 760d5ec69a
1 changed files with 33 additions and 2 deletions
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35
imgui.h
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@ -43,7 +43,7 @@ Index of this file:
// [SECTION] Dear ImGui end-user API functions
// [SECTION] Flags & Enumerations
// [SECTION] Tables API flags and structures (ImGuiTableFlags, ImGuiTableColumnFlags, ImGuiTableRowFlags, ImGuiTableBgTarget, ImGuiTableSortSpecs, ImGuiTableColumnSortSpecs)
// [SECTION] Helpers: Debug log, Memory allocations macros, ImVector<>
// [SECTION] Helpers: Debug log, Memory allocations macros, ImVector<>, Unreachable
// [SECTION] ImGuiStyle
// [SECTION] ImGuiIO
// [SECTION] Misc data structures (ImGuiInputTextCallbackData, ImGuiSizeCallbackData, ImGuiPayload)
@ -2150,7 +2150,7 @@ struct ImGuiTableColumnSortSpecs
};
//-----------------------------------------------------------------------------
// [SECTION] Helpers: Debug log, memory allocations macros, ImVector<>
// [SECTION] Helpers: Debug log, memory allocations macros, ImVector<>, Unreachable
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
@ -2255,6 +2255,37 @@ struct ImVector
};
IM_MSVC_RUNTIME_CHECKS_RESTORE
//-----------------------------------------------------------------------------
// ImGui::Unreachable()
// Provides an equivalent for std::unreachable() for C++<23. This signals to the compiler that a region is unreachable, allowing optimizations.
//-----------------------------------------------------------------------------
// If you are using C++>=23, use std::unreachable() in <utility>, and you may also define STD_UNREACHABLE_IS_AVAILABLE to substitute definitions.
// Code is from: https://en.cppreference.com/w/cpp/utility/unreachable.html
// Inclusion in the ImGUI namespace is chosen to avoid possible namespace collisions with stdlib >= 23.
//-----------------------------------------------------------------------------
namespace ImGui
{
//#define STD_UNREACHABLE_IS_AVAILABLE
#ifdef STD_UNREACHABLE_IS_AVAILABLE
#include <utility>
constexpr const auto Unreachable = ::std::unreachable;
#undef STD_UNREACHABLE_IS_AVAILABLE
#else
[[noreturn]] inline void Unreachable()
{
// Uses compiler specific extensions if possible.
// Even if no extension is used, undefined behavior is still raised by
// an empty function body and the noreturn attribute.
#if defined(_MSC_VER) && !defined(__clang__) // MSVC
__assume(false);
#else // GCC, Clang
__builtin_unreachable();
#endif
}
#endif
} // namespace ImGui
//-----------------------------------------------------------------------------
// [SECTION] ImGuiStyle
//-----------------------------------------------------------------------------