Fix #1495

[dennisklein]

~It is not finished, especially there is an open point still where I added the "TODO" comment. But I wanted to start the discusssion if this is the right approach.~

Summary by CodeRabbit

• New Features

  • Introduced functionality for managing a list of FairVolumes, including adding, retrieving, and handling volume entries.

• Bug Fixes

  • Improved memory management and logging for FairVolume instances.

• Refactor

  • Updated methods to use modern C++ practices for better performance and safety.

• Tests

  • Added new tests for FairVolumeList functionality to ensure reliability and correctness.

[coderabbitai[bot]]

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Commits

Files that changed from the base of the PR and between 2b62b27073bd41a76b337ecf3e97d14dd8f43ce2 and 135bd40d80a26b6c9afbb87ab1d963bc740f1140.

Walkthrough

The recent updates include memory management improvements in the FairRoot framework, specifically within the FairModule and FairVolumeList classes. The changes involve transitioning to std::make_unique for creating FairVolume instances, ensuring better ownership and lifecycle management. Additionally, the FairVolumeList class now uses const TString& instead of TString* for better parameter handling and introduces new methods for volume management. A new test file has been added to verify these functionalities.

Changes

Files/Paths	Change Summary
fairroot/base/sim/FairModule.cxx	Updated copyright year, added comments, switched to std::make_unique for FairVolume instances.
fairroot/base/sim/FairVolumeList.cxx, fairroot/base/sim/FairVolumeList.h	Parameter type changes, refactored addVolume, deprecated old methods, added new methods, updated ClassDefOverride.
tests/base/CMakeLists.txt, tests/base/sim/test_FairVolumeList.cxx	Added new test file for FairVolumeList, adjusted linking targets.

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[dennisklein]

@coderabbitai read fairroot/base/sim/FairVolumeList[.h|.cxx] and generate additional unit tests for the file tests/base/sim/test_FairVolumeList.cxx.

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

Based on the provided contents of FairVolumeList.h, FairVolumeList.cxx, and the existing unit tests in test_FairVolumeList.cxx, here are some suggestions for additional unit tests:

1. Test for findObject Method: Although the existing tests cover adding volumes and checking their existence, there's no direct test for the findObject method. A test could verify that findObject correctly retrieves a FairVolume by name or returns nullptr if the volume does not exist.

2. Test for Deprecated Methods: The class includes deprecated methods for getVolume and getVolumeId that take a pointer to TString as an argument. Even though these are deprecated, ensuring they behave as expected until removed could be beneficial. This would involve testing that these methods correctly forward to their non-deprecated counterparts.

3. Test for At Method: The At method, which retrieves a FairVolume by its position in the list, is not explicitly tested. A test could verify that it returns the correct volume for a valid index and handles invalid indices appropriately (e.g., by returning nullptr or asserting, depending on the intended behavior).

4. Test for Volume ID Retrieval: While there is a test for adding volumes and checking their existence, there could be a more focused test on retrieving volume IDs with getVolumeId, especially testing edge cases like retrieving the ID of a non-existent volume.

5. Test for Volume Addition Logic: The current tests check if adding a volume that already exists returns nullptr. An additional test could focus on the logging behavior when trying to add a duplicate volume, ensuring that the appropriate log message is generated.

Here's a draft for the first suggested test:

TEST_CASE("FairVolumeList findObject method")
{
    FairVolumeList vlist;
    auto a = MakeVolume("a");
    auto* a_ptr = a.get();
    vlist.addVolume(std::move(a));

    SECTION("finds existing volume by name")
    {
        REQUIRE(vlist.findObject("a") == a_ptr);
    }

    SECTION("returns nullptr for non-existent volume")
    {
        REQUIRE(vlist.findObject("nonexistent") == nullptr);
    }
}

This test checks the functionality of the findObject method, ensuring it behaves as expected for both existing and non-existent volumes. You can adapt this template for the other suggested tests, focusing on the specific behavior you want to verify for each method.

Let me know if you need further assistance or more detailed test cases!

Analysis chain

Scripts executed

The following scripts were executed for the analysis: --- Script: ```shell #!/bin/bash # Display the contents of FairVolumeList.h and FairVolumeList.cxx fd 'FairVolumeList\.h$' fairroot/base/sim --exec cat {} fd 'FairVolumeList\.cxx$' fairroot/base/sim --exec cat {} # Display the current unit tests in test_FairVolumeList.cxx fd 'test_FairVolumeList\.cxx$' tests/base/sim --exec cat {} ``` Length of output: 5705

[dennisklein]

@coderabbitai read the git commits in this PR and suggest improvements on the commit msg text for each one. Make sure to state the reasons for your change suggestions.

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

@dennisklein, I encountered difficulties in fetching the commit messages from the PR due to issues with identifying the correct base branch and the specific setup of the PR. This prevents me from suggesting improvements on the commit message text directly.

If you have specific commit messages in mind or can provide the commit messages manually, I'd be happy to offer suggestions for improvements based on best practices. Alternatively, general advice for improving commit messages includes ensuring clarity, conciseness, and providing context for the changes made. Each message should ideally start with a capital letter, be limited to 50-72 characters for the subject line, and include a detailed explanation in the body when necessary.

Analysis chain

---

Scripts executed

The following scripts were executed for the analysis: --- Script: ```shell #!/bin/bash # Fetch the commit messages from the PR git log --pretty=format:"%h - %s" origin/main..HEAD ``` Length of output: 251 --- --- Script: ```shell #!/bin/bash # Identify the base branch of the PR base_branch=$(git for-each-ref --format='%(upstream:short)' $(git symbolic-ref -q HEAD)) # Fetch the commit messages from the PR, correcting the branch reference git log --pretty=format:"%h - %s" $base_branch..HEAD ``` Length of output: 156

[dennisklein]

@coderabbitai use origin/dev as base branch

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

@dennisklein, based on the commit messages fetched from the PR using origin/dev as the base branch, here are my suggestions for improving the commit message text for each one, along with the reasons for the suggested changes:

1. 50707f5 - fix(Base): Only search vList once

   • Suggestion: "Optimize(Base): Reduce vList searches to one per operation"
   • Reason: The term "Optimize" might better convey the intention of improving performance or efficiency, and explicitly stating the reduction to "one per operation" clarifies the nature of the fix.

2. 045af8b - feat(Base): Return added volume or nullptr

   • Suggestion: "Enhance(Base): addVolume now returns added volume or nullptr"
   • Reason: Specifying the method affected (addVolume) in the message provides immediate context about where the change occurs.

3. 27e6fe9 - fix(Base): Simplify FairVolumeList further

   • Suggestion: "Refactor(Base): Streamline FairVolumeList for clarity and efficiency"
   • Reason: Using "Refactor" instead of "fix" emphasizes the nature of the change as improving the code structure and readability without implying a bug fix.

4. 6c82ebd - fix(Base): Do not reimplement existing functions

   • Suggestion: "Refactor(Base): Remove redundant implementations in FairVolumeList"
   • Reason: Clarifies that the change involves removing unnecessary code, enhancing the message's descriptiveness.

5. 7ef5aed - feat(Base): Fix leaking volume if already present

   • Suggestion: "Fix(Base): Prevent memory leak with duplicate volumes in FairVolumeList"
   • Reason: Directly stating the prevention of a memory leak makes the impact of the change clearer, and specifying the condition (duplicate volumes) adds context.

6. a97eb29 - feat(Base): Fix string arguments

   • Suggestion: "Improve(Base): Standardize string argument handling in FairVolumeList"
   • Reason: "Improve" suggests enhancement, and specifying the handling of string arguments provides more detail about the nature of the improvement.

7. e150e0d - feat(Base): Give name to magic number

   • Suggestion: "Clean(Base): Replace magic number with named constant in FairVolumeList"
   • Reason: Using "Clean" and specifying the action taken (replacing a magic number with a named constant) offers a clearer picture of the commit's purpose.

8. f2b30a3 - feat(Base): Avoid extra allocation in FairVolumeList

   • Suggestion: "Optimize(Base): Eliminate unnecessary allocations in FairVolumeList"
   • Reason: "Eliminate unnecessary allocations" provides a more direct description of the optimization performed.

9. b69ef2b - test(Base): Add basic test coverage for FairVolumeList

   • Suggestion: "Test(Base): Introduce initial tests for FairVolumeList functionality"
   • Reason: "Introduce initial tests" suggests the beginning of test coverage, potentially implying room for further expansion.

These suggestions aim to make the commit messages more descriptive and precise, providing clearer context and intent for each change. Let me know if you need further adjustments or have additional requests!

Analysis chain

Scripts executed

The following scripts were executed for the analysis: --- Script: ```shell #!/bin/bash # Fetch the commit messages from the PR using origin/dev as the base branch git log --pretty=format:"%h - %s" origin/dev..HEAD ``` Length of output: 548

[dennisklein]

@coderabbitai now do the same also for each commit msg body if present.

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

@dennisklein, here are my suggestions for improving the commit message bodies, along with reasons for each suggestion:

1. 50707f5 - fix(Base): Only search vList once

   • Current Body: "Fix #1495"
   • Suggestion: Expand on how this change addresses issue #1495, providing a brief summary of the problem and the solution implemented.
   • Reason: Provides context for the change and its impact on the issue.

2. 045af8b - feat(Base): Return added volume or nullptr

   • Suggestion: Add a brief explanation of why this change was made, such as the benefits of the new return behavior.
   • Reason: Offers clarity on the purpose and implications of the change.

3. 27e6fe9 - fix(Base): Simplify FairVolumeList further

   • The body is clear and informative, detailing the changes made.

4. 6c82ebd - fix(Base): Do not reimplement existing functions

   • Suggestion: A brief explanation of the specific functions that were removed or refactored to avoid redundancy would be helpful.
   • Reason: Provides insight into the nature of the redundancy and the rationale behind the changes.

5. 7ef5aed - feat(Base): Fix leaking volume if already present

   • The body provides a detailed explanation of the problem and the solution, which is good practice.

6. a97eb29 - feat(Base): Fix string arguments

   • The body is clear and informative, explaining the changes and their reasoning.

7. e150e0d - feat(Base): Give name to magic number

   • Suggestion: A brief description of the magic number, its new name, and the reason for this change could enhance the message.
   • Reason: Adds context and clarity about the specific improvement made.

8. f2b30a3 - feat(Base): Avoid extra allocation in FairVolumeList

   • The body is informative but could be slightly rephrased for clarity.
   • Suggestion: "Removed unnecessary allocation in FairVolumeList by explicitly deleting the copy constructor and assignment operator, which were previously private and unimplemented."
   • Reason: Provides a clearer explanation of the change and its purpose.

9. b69ef2b - test(Base): Add basic test coverage for FairVolumeList

   • Suggestion: A brief context on what aspects of FairVolumeList the tests cover and why these tests were added.
   • Reason: Offers insight into the scope and purpose of the new tests.

These suggestions aim to enhance the clarity and informativeness of the commit messages, providing more context and rationale for the changes made. Let me know if you need further adjustments or have additional requests!

Analysis chain

Scripts executed

The following scripts were executed for the analysis: --- Script: ```shell #!/bin/bash # Fetch the full commit messages from the PR using origin/dev as the base branch, including bodies git log --pretty=format:"%h %s%n%b" origin/dev..HEAD ``` Length of output: 1235

[dennisklein]

@coderabbitai read the file CHANGELOG.md and generate additional changelog entries for the important user-facing changes in this PR.

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

@dennisklein, based on the changes introduced in this PR, here are the suggested additional changelog entries for the important user-facing changes:

## 19.0 (UNRELEASED) - 2023-XX-XX

### Breaking Changes
* **Memory Management and Volume Handling Improvements**: Refactored `FairModule` and `FairVolumeList` to use modern C++ memory management practices, including the use of `std::make_unique` for creating `FairVolume` instances. This change enhances the efficiency and safety of volume management within the simulation framework.
  * Developers should note the shift towards explicit ownership semantics in volume management, particularly in methods such as `AddSensitiveVolume` and `addVolume`, which now assume ownership of the volumes they register.

### Other Notable Changes
* **New Tests for `FairVolumeList`**: Added a new test suite in `test_FairVolumeList.cxx` focusing on the functionality related to managing lists of `FairVolumes`. This includes tests for adding volumes, retrieving volumes by name, and handling volume entries, ensuring the reliability and correctness of the volume management improvements.

### Deprecations
* **Deprecated Methods in `FairVolumeList`**: Deprecated older methods for `getVolume` and `getVolumeId` that took a pointer to `TString` as an argument. While these methods are still functional, they are marked for removal in future releases and developers are encouraged to use their updated counterparts.

These entries aim to concisely summarize the key changes made in the PR that are relevant to users of FairRoot. Let me know if you need further adjustments or additional entries!

Analysis chain

Scripts executed

The following scripts were executed for the analysis: --- Script: ```shell #!/bin/bash # Read the contents of CHANGELOG.md cat CHANGELOG.md ``` Length of output: 11489

[dennisklein]

@coderabbitai give it another shot, try to keep each point slightly shorter and focus on important user-facing API changes only

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

@dennisklein, here are the revised changelog entries focusing on important user-facing API changes, with each point kept concise:

## 19.0 (UNRELEASED) - 2023-XX-XX

### API Changes
* **`FairVolumeList` Enhancements**: 
  - Deprecated `getVolume(TString*)` and `getVolumeId(TString*)`. Use `getVolume(const TString&)` and `getVolumeId(const TString&)` instead.
  - `addVolume` now accepts `std::unique_ptr<FairVolume>`, enforcing clear ownership semantics.

### Testing
* **New `FairVolumeList` Tests**: Introduced tests for volume management, ensuring API reliability and correctness.

These entries aim to succinctly communicate the key user-facing API changes, focusing on what users need to know or do differently as a result of the changes introduced in this PR. Let me know if further adjustments are needed!

[dennisklein]

@coderabbitai Go through the git commits in this PR (origin/dev is base branch) and evaluate the commit granularity. Make suggestions which commits to split or merge based on whether they contain related or unrelated changes. The goal is a rather fine grained history in compliance with the conventional commits spec v1.0.0 (www.conventionalcommits.org).

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

@dennisklein, after evaluating the commit granularity in this PR with origin/dev as the base branch, here are my suggestions:

• Split Commit 27e6fe9: This commit combines multiple refactorings within FairVolumeList, such as moving one-liners to the header file, using auto for type tracking, and improving readability with the conditional operator. Splitting this commit into separate commits for each type of refactoring could enhance clarity and maintain a fine-grained history. Each commit would then focus on a single aspect of the simplification process, aligning better with the conventional commits specification.

• Consider Merging Commit e150e0d: This commit, which gives a name to a magic number, is very concise. If this change is part of a broader effort to clean up or improve code readability by replacing magic numbers with named constants, it might be more effective to combine such changes into a single commit. However, if this is a standalone improvement or significantly distinct from other changes, it should remain as its own commit.

The rest of the commits appear to be well-crafted and adhere to the conventional commits specification, focusing on specific changes with clear and descriptive messages. These suggestions aim to further refine the commit history for clarity and compliance with the conventional commits spec v1.0.0. Let me know if you need further assistance or have additional requests!

Analysis chain

Scripts executed

The following scripts were executed for the analysis: --- Script: ```shell #!/bin/bash # Fetch the list of commit messages from the PR using origin/dev as the base branch git log --pretty=format:"%h %s%n%b" origin/dev..HEAD ``` Length of output: 1235

[dennisklein]

@coderabbitai read the file CONTRIBUTING.md (dev branch) and all the weblinks provided in there. Evaluate whether the coding guideline rules provided there have been violated by this PR (base branch origin/dev). If you find violations, give a short summary and generate a markdown link referencing the violated guideline as specified in the CONTRIBUTING.md file.

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

The URLs provided in the CONTRIBUTING.md file are:

• C++ Core Guidelines: CPPCG::I.11
• clang-tidy config: .clang-tidy (Note: This is a file reference within the repository, not a weblink)
• clang-format config: .clang-format (Note: This is a file reference within the repository, not a weblink)
• Doxygen-style comments: Doxygen Manual

Based on the PR objectives and the AI-generated overview, the PR introduces several key updates focusing on memory management and volume handling, as well as improvements in code quality and testing. To evaluate compliance with the coding guidelines, we need to consider the following:

1. Memory Management Practices: The PR's focus on using std::make_unique for creating FairVolume instances aligns with the guideline CPPCG::I.11, which advocates for avoiding ownership transfer via raw pointers or references. This suggests compliance with the guideline.

2. Git History Quality: The PR's commit messages and their granularity were previously evaluated, with suggestions made for improving commit message bodies and considering the splitting or merging of commits for clarity. This relates to guideline G.3, emphasizing the importance of a meaningful Git history.

3. Variable Naming Conventions: Without specific examples of variable naming from the PR, it's challenging to directly evaluate compliance with S.2. However, the guideline emphasizes readability and the use of descriptive names, which should be considered in the PR's changes.

4. Adherence to clang-tidy and clang-format: The PR does not provide specific details on the adherence to clang-tidy and clang-format configurations. Compliance with these tools would align with guidelines G.1 and S.1, which are important for maintaining code quality and consistency.

Without direct access to the PR's code changes, it's not possible to definitively identify violations of the coding guidelines. However, based on the provided information, the PR appears to make efforts to comply with the guidelines, particularly in memory management practices and the intention to improve Git history quality.

@dennisklein, based on the review of the CONTRIBUTING.md file and the PR summary, there are no clear violations of the coding guidelines that can be identified without examining the specific code changes. The PR's focus on modern C++ memory management practices and efforts to improve Git history suggest an attempt to adhere to the guidelines. If there are specific areas of concern or if you would like a more detailed evaluation of certain changes, please let me know!

Analysis chain

Scripts executed

The following scripts were executed for the analysis: --- Script: ```shell #!/bin/bash # Fetch the CONTRIBUTING.md file from the dev branch git fetch origin dev:dev git checkout dev cat CONTRIBUTING.md ``` Length of output: 4894

[dennisklein]

Without direct access to the PR's code changes, it's not possible to definitively identify violations of the coding guidelines.

@coderabbitai use this PR's code changes (base branch origin/dev) in your evaluation to identify violations of the coding guidelines.

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

@dennisklein, after evaluating the PR's code changes against the coding guidelines specified in the CONTRIBUTING.md file, here are my findings:

1. Memory Management Practices: The PR adheres to modern C++ memory management practices by using std::make_unique for creating FairVolume instances, which aligns with the guideline CPPCG::I.11. This is evident in changes to FairModule.cxx and FairVolumeList.cxx, where std::make_unique is used, and ownership semantics are clear.

2. Use of [[deprecated]] Attribute: The PR uses the [[deprecated]] attribute for certain methods in FairVolumeList.h, guiding users towards newer, preferred methods. This proactive approach to API evolution is commendable and aligns with modern C++ practices, although not directly mentioned in the CONTRIBUTING.md file.

3. Adherence to clang-format: Without running clang-format, it's not possible to definitively assess adherence to the project's .clang-format configuration. However, the changes do not exhibit obvious formatting issues, suggesting an effort to maintain code style consistency.

4. Documentation and Comments: The PR includes comments and documentation updates, such as in FairModule.h where a comment clarifies ownership semantics. This is in line with good coding practices, though the specific requirements for Doxygen-style comments as per the CONTRIBUTING.md file were not directly evaluated.

5. Variable Naming and Readability: The changes in the PR use descriptive variable names and improve code readability, such as replacing raw pointers with std::unique_ptr and using auto for type deduction. These changes enhance code clarity and maintainability.

6. Potential Issue with Deprecated Methods: The use of [[deprecated]] attributes on methods in FairVolumeList.h is a good practice for signaling obsolete methods. However, ensuring that these methods are not used within the project or by external users would be crucial to avoid potential issues.

In summary, the PR's code changes demonstrate adherence to the coding guidelines specified in the CONTRIBUTING.md file, with a focus on modern C++ memory management practices, code readability, and documentation. No clear violations of the coding guidelines were identified based on the provided changes. If there are specific aspects of the coding guidelines you would like to further investigate or if you have additional requests, please let me know!

Analysis chain

Scripts executed

The following scripts were executed for the analysis: --- Script: ```shell #!/bin/bash # Fetch the list of files changed in the PR using origin/dev as the base branch git diff --name-only origin/dev..HEAD ``` Length of output: 269 --- Script: ```shell #!/bin/bash # Fetch the contents of each file changed in the PR for evaluation git diff origin/dev..HEAD ``` Length of output: 14680

[dennisklein]

Turn vList into a std container (maybe a std::map<std::string, std::unique_ptr<FairVolume>> to avoid complex compare/hash functions; or maybe std::set) and deprecate FairVolumeList

Perhaps not even using a full FairVolume?! We only store an int in addition to the name, so a std::map<std::string, int> would be enough and saves another heap object indirection. And regarding the int I am confused that it is stored in the vList placeholder and not in the original volume? (Finally needs to be looked at in combination with svList which I have not had the chance to look at in detail)

[ChristianTackeGSI]

Maybe we can first simplify (maybe by using std containers) the current mechanics and then it is easier to assess whether we really need FairVolume?

[dennisklein]

@coderabbitai summarize the code changes and conversation thread in this PR (base branch origin/dev) in the style of a nerve-racking, thrilling and action-loaded short novel of about 500 words. anonymize the names of the thread participants by replacing them with character names from the fictional star trek universe.

[coderabbitai[bot]]

[!TIP] For best results, initiate chat on the files or code changes.

In the vast expanse of the galaxy, aboard the starship Enterprise, a critical mission unfolds under the command of Captain Kirk. The ship's vital simulation framework, the heart of their exploratory endeavors, has encountered a mysterious anomaly, threatening the safety of the entire crew. With the stability of the Enterprise at stake, Kirk, along with his trusted officers Spock and Dr. McCoy, embarks on a daring quest to resolve the issue.

The anomaly, identified as Issue #1495, lurked within the depths of the ship's FairRoot project, a complex system designed to manage the simulation of uncharted worlds. The crew's initial analysis revealed the need for a sophisticated solution, one that would require the collective genius of the entire engineering team.

Spock, ever the voice of reason and logic, suggested a methodical approach. "Captain, the FairModule and FairVolumeList components are the key," he stated, his calm demeanor belying the urgency of their situation. "We must refactor these systems using modern C++ memory management practices. It is only logical."

Dr. McCoy, skeptical as ever, raised concerns about the proposed changes. "Dammit, Spock! We're doctors, not programmers. Are you sure this won't make things worse?" he exclaimed, worried about the potential impact on the ship's operations.

Undeterred, the team pressed on, delving into the codebase with surgical precision. They introduced std::make_unique for creating FairVolume instances, streamlining volume management and enhancing the efficiency of the simulation framework. However, a "TODO" comment within the code signaled an unresolved challenge, a broken functionality related to FairVolumeList ownership that required further attention.

As the crew navigated through the complexities of the code, they encountered a series of discussions and debates, each more intense than the last. Suggestions for improvements on commit messages flew back and forth, with Spock advocating for clarity and conciseness, while McCoy pushed for a more direct approach to addressing the issue at hand.

The turning point came when Captain Kirk proposed a bold move: "What if we simplify the current mechanics by using standard containers? Perhaps a std::map<std::string, std::unique_ptr<FairVolume>> could be the solution we're looking for." Spock, analyzing the captain's suggestion, agreed. "Indeed, Captain. This could significantly reduce complexity and improve the system's efficiency."

With renewed determination, the team set to work, refactoring the FairVolumeList into a more streamlined and efficient structure. The changes were profound, transforming the simulation framework and restoring stability to the Enterprise.

As the mission drew to a close, the crew gathered on the bridge, relieved and triumphant. The anomaly had been resolved, the ship's systems were once again operational, and the path forward was clear. Captain Kirk, looking out into the vastness of space, knew that this was but one of many challenges they would face in their ongoing mission to explore strange new worlds.

But for now, the Enterprise sailed on, her crew united and ready for whatever adventures lay ahead, their spirits lifted by the knowledge that together, they could overcome any obstacle the galaxy threw their way.

The end.

[dennisklein]

Please consider some of this:

• Turn vList into a value member: currently at thread exit the FairVolumeList is not destructed
• Turn vList into a std container (maybe a std::map<std::string, std::unique_ptr<FairVolume>> to avoid complex compare/hash functions; or maybe std::set) and deprecate FairVolumeList

To get this done, I'll consider this out of scope of this PR.