Use concepts guards - #82
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Summary
tensor_expr_holderandtensor_to_scalar_expr_holderconcepts, mirroring the existingscalar_expr_holderscalar_expr_holderfromscalar_std.htoscalar_expression.hso it's available earlier in the include chaintemplate <typename>andenable_if_tSFINAE in tensor and tensor_to_scalar function templates with concept constraintsFiles changed
scalar_expression.h/scalar_std.h— moved concept definitiontensor_expression.h— addedtensor_expr_holdertensor_to_scalar_expression.h— addedtensor_to_scalar_expr_holdertensor_functions.h— constrained 15 templates (dev,sym,vol,skew,inner_product,otimes,otimesu,otimesl,permute_indices,trans,inv)tensor_std.h— constrained 2powoverloadstensor_to_scalar_std.h— constrained 7 templates (pow×4,log,exp,sqrt)