scopeDescription.h

//
// Copyright 2016 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_BASE_TF_SCOPE_DESCRIPTION_H
#define PXR_BASE_TF_SCOPE_DESCRIPTION_H

#include "pxr/pxr.h"

#include "pxr/base/tf/callContext.h"
#include "pxr/base/tf/preprocessorUtils.h"
#include "pxr/base/tf/stringUtils.h"
#include "pxr/base/tf/api.h"

#include <boost/optional.hpp>
#include <boost/preprocessor/if.hpp>

#include <vector>
#include <string>

PXR_NAMESPACE_OPEN_SCOPE

class TfScopeDescription
{
    TfScopeDescription() = delete;
    TfScopeDescription(TfScopeDescription const &) = delete;
    TfScopeDescription &operator=(TfScopeDescription const &) = delete;
public:
    TF_API explicit
    TfScopeDescription(std::string const &description,
                       TfCallContext const &context = TfCallContext());

    TF_API explicit
    TfScopeDescription(std::string &&description,
                       TfCallContext const &context = TfCallContext());

    TF_API explicit
    TfScopeDescription(char const *description,
                       TfCallContext const &context = TfCallContext());

    TF_API ~TfScopeDescription();

    TF_API void SetDescription(std::string const &description);

    TF_API void SetDescription(std::string &&description);

    TF_API void SetDescription(char const *description);

private:
    friend inline TfScopeDescription *
    Tf_GetPreviousScopeDescription(TfScopeDescription *d) {
        return d->_prev;
    }
    friend inline char const *
    Tf_GetScopeDescriptionText(TfScopeDescription *d) {
        return d->_description;
    }
    friend inline TfCallContext const &
    Tf_GetScopeDescriptionContext(TfScopeDescription *d) {
        return d->_context;
    }
    
    inline void _Push();
    inline void _Pop() const;
    
    boost::optional<std::string> _ownedString;
    char const *_description;
    TfCallContext _context;
    void *_localStack;
    TfScopeDescription *_prev; // link to parent scope.
};

TF_API std::vector<std::string>
TfGetCurrentScopeDescriptionStack();

TF_API std::vector<std::string>
TfGetThisThreadScopeDescriptionStack();

#define TF_DESCRIBE_SCOPE(fmt, ...)                                            \
    TfScopeDescription __scope_description__                                   \
    (BOOST_PP_IF(TF_NUM_ARGS(__VA_ARGS__),                                     \
                 TfStringPrintf(fmt, __VA_ARGS__), fmt), TF_CALL_CONTEXT)

PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_BASE_TF_SCOPE_DESCRIPTION_H