DAAL under C++20 does not compile due to DR 2237

[ZijunHui]

When including the header daal.h, the program fails to compile when C++20 enabled. This is due to the inclusion of DR 2237 into the standard, which prohibits simple-template-ids in constructors. As a result, certain class constructors are malformed under C++20 and they fail to compile. At the end of the link above, a similar error case is described.

To Reproduce
Steps to reproduce the behavior:

1. Assume the following file

#include "daal.h"
int main(){}

2. Compile with g++ --std=c++17, observe that it compiles without errors.
3. Compile with g++ --std=c++20, observe that multiple expected unqualified-id before ‘)’ token errors are thrown for constructors for certain classes.

In file included from /opt/intel/oneapi/dal/2024.5/include/dal/algorithms/linear_regression/linear_regression_training_distributed.h:32,
                 from /opt/intel/oneapi/dal/latest/include/daal.h:74,
                 from t.cpp:1:
/opt/intel/oneapi/dal/2024.5/include/dal/algorithms/linear_regression/linear_regression_training_types.h: At global scope:
/opt/intel/oneapi/dal/2024.5/include/dal/algorithms/linear_regression/linear_regression_training_types.h:287:35: error: expected unqualified-id before ‘)’ token
  287 |     DistributedInput<step2Master>();
      |                                   ^
In file included from /opt/intel/oneapi/dal/latest/include/daal.h:74,
                 from t.cpp:1:
/opt/intel/oneapi/dal/2024.5/include/dal/algorithms/linear_regression/linear_regression_training_distributed.h:148:54: error: expected unqualified-id before ‘)’ token
  148 |     Distributed<step1Local, algorithmFPType, method>() {}
      |                                                      ^
In file included from /opt/intel/oneapi/dal/2024.5/include/dal/algorithms/pca/pca_types.h:33,
                 from /opt/intel/oneapi/dal/latest/include/daal.h:107,
                 from t.cpp:1:
/opt/intel/oneapi/dal/2024.5/include/dal/algorithms/covariance/covariance_distributed.h:567:54: error: expected unqualified-id before ‘)’ token
  567 |     Distributed<step1Local, algorithmFPType, method>() : Online<algorithmFPType, method>() {}
      |                                                      ^
In file included from /opt/intel/oneapi/dal/latest/include/daal.h:230,
                 from t.cpp:1:
/opt/intel/oneapi/dal/2024.5/include/dal/algorithms/ridge_regression/ridge_regression_training_distributed.h:141:54: error: expected unqualified-id before ‘)’ token
  141 |     Distributed<step1Local, algorithmFPType, method>() : Online<algorithmFPType, method>() {}
      |

Expected behavior
No errors should occur. Interestingly, clang does not throw an error for this case.

Environment:

• OS: Ubuntu 22.04
• Compiler: g++ 11.4.0
• Version: 2024.5