tryInvoke.h

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//
// Copyright 2026 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_BASE_TF_TRY_INVOKE_H
#define PXR_BASE_TF_TRY_INVOKE_H
 
 
#include "pxr/pxr.h"
 
#include <functional>
#include <optional>
#include <type_traits>
 
template <class Ret>
constexpr auto
TfNotInvoked()
{
    if constexpr (std::is_void_v<Ret>) {
        return false;
    } else {
        return std::optional<Ret>{};
    }
}
 
template <class Ret, class Fn, class... Args>
auto
TfTryInvoke(Fn &&fn, Args &&...args)
{
    if constexpr (std::is_invocable_v<Fn, Args...>) {
        if constexpr (std::is_void_v<Ret>) {
            std::invoke(std::forward<Fn>(fn), std::forward<Args>(args)...);
            return true;
        } else {
            return std::optional<Ret>(
                std::invoke(std::forward<Fn>(fn), std::forward<Args>(args)...));
        }
    } else {
        return TfNotInvoked<Ret>();
    }
}
 
#endif // PXR_BASE_TF_TRY_INVOKE_H