expressionVariablesDependencyData.h

//
// Copyright 2023 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef PXR_USD_PCP_EXPRESSION_VARIABLES_DEPENDENCY_DATA_H
#define PXR_USD_PCP_EXPRESSION_VARIABLES_DEPENDENCY_DATA_H
 
#include "pxr/pxr.h"
#include "pxr/usd/pcp/api.h"
#include "pxr/base/tf/declarePtrs.h"
#include "pxr/base/tf/functionRef.h"
 
#include <memory>
#include <unordered_set>
#include <string>
 
PXR_NAMESPACE_OPEN_SCOPE
 
TF_DECLARE_WEAK_PTRS(PcpLayerStack);
 
class PcpExpressionVariablesDependencyData
{
public:
    PCP_API
    PcpExpressionVariablesDependencyData();
 
    PCP_API
    PcpExpressionVariablesDependencyData(
        PcpExpressionVariablesDependencyData&&);
 
    PCP_API
    ~PcpExpressionVariablesDependencyData();
 
    PCP_API
    PcpExpressionVariablesDependencyData& operator=(
        PcpExpressionVariablesDependencyData&&);
 
    PCP_API
    bool IsEmpty() const;
 
    PCP_API
    void AppendDependencyData(PcpExpressionVariablesDependencyData&& data);
 
    PCP_API
    void AddDependencies(
        const PcpLayerStackPtr& layerStack,
        std::unordered_set<std::string>&& exprVarDependencies);
 
    template <class Callback>
    void ForEachDependency(const Callback& callback) const
    {
        _ForEachFunctionRef fn(callback);
        _ForEachDependency(fn);
    }
 
    PCP_API
    const std::unordered_set<std::string>*
    GetDependenciesForLayerStack(const PcpLayerStackPtr& layerStack) const;
 
private:
    using _ForEachFunctionRef = TfFunctionRef<void(
        const PcpLayerStackPtr&, const std::unordered_set<std::string>&)>;
 
    PCP_API
    void _ForEachDependency(const _ForEachFunctionRef& fn) const;
 
    class _Data;
    const _Data* _GetData() const;
    _Data& _GetWritableData();
 
    std::unique_ptr<_Data> _data;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif