In ilodiet.cpp, the main part of the application starts by declaring the environment and terminates by calling the method end for that environment. The code in between is encapsulated in a try block that catches all Concert Technology exceptions and prints them to the C++ error stream cerr. All other exceptions are caught as well, and a simple error message is issued. The first action of the program is to evaluate command-line options and call the function usage in cases of misuse.
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In such cases, an exception is thrown. This practice makes sure that env.end is called before the program is terminated.
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