Fix static initialization order for UserFormatRegister map#202
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mhochsteger merged 1 commit intoNGSolve:masterfrom Mar 27, 2026
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A std::map is in an invalid state when just zero-initialized, and needs to be initialized by its constructor. As this initilization may be done after the first call to Register, a crash will typically happen. To fix this wrap all accesses to the map with a Meyers Singleton. Also remove the extra Array - most accesses are using the key, and the few format list iterations all sort the result afterwards anyway. Fixes NGSolve#201.
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There is also PR #125, which addresses the same problem elsewhere. Unfortunately, that has not been updated. |
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Merged, thanks! |
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A std::map is in an invalid state when just zero-initialized, and needs to be initialized by its constructor. As this initilization may be done after the first call to Register, a crash will typically happen.
To fix this wrap all accesses to the map with a Meyers Singleton. Also remove the extra Array - most accesses are using the key, and the few format list iterations all sort the result afterwards anyway.
Fixes #201.