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Using the existing tests for padded layouts requires the following changes: * The padded layouts are template classes. In order to be able to use partially specialized templates, functions need to be converted to structs. * The layout mapping tests include a check that only applies if is_exhaustive is static. This commit introduces a concept to check if is_exhaustive is a static member function. * Fix a test to not use a hard-coded layout_left. The test empty.cc contains indentation mistakes that are fixed. libstdc++-v3/ChangeLog: * testsuite/23_containers/mdspan/layouts/empty.cc: Fix indent. * testsuite/23_containers/mdspan/layouts/mapping.cc (test_stride_1d): Fix test. (test_stride_2d): Rewrite using a struct. (test_stride_3d): Ditto. (has_static_is_exhaustive): New concept. (test_mapping_properties): Update test. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com> Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Signed-off-by: Luc Grosheintz <luc.grosheintz@gmail.com>
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