Why does C++ not create a more compact structure?

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C++ is designed to balance performance and memory efficiency. While it may be possible to create a more compact structure, it could negatively impact the performance of the program. For example, making a structure more compact might involve packing data more tightly together, which could reduce memory usage but also make accessing that data less efficient. Additionally, C++ allows for low-level memory manipulation, which means that programmers can optimize memory usage themselves if they need to. Therefore, in most cases, the trade-off between performance and memory efficiency is acceptable, and C++ structures are designed to maximize both.