The present diffusion of the object-oriented paradigm and of the techniques for maintaining under control the development process must be supported by suitable tools. These tools should be based on confident and validated object-oriented metrics for assessing the several aspects of product and process development: effort, maintainability, re-usability, etc, as well as they should be capable of supporting the definition of specific metrics, profiles and histograms. These are useful to give the developers and managers an immediate representation of the system status. These tools must also provide metrics suitable for producing confident results since the early phases of the development life cycle. Mechanisms for metrics definition, validation and tuning must be available in order to establish a process of continuous improvement. This paper presents TAC++ (Tool for Analyzing C++ Code) which supports all mentioned features and includes the most important metrics presented in the literature and many others.