How to analyze Visual Studio assert macros and static assertions static_assert

Today, I will talk to you about how to analyze Visual Studio assert macros and static assertions of static_assert. Many people may not know much about it. In order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

Visual Studio has a lot to learn. Here we mainly introduce Visual Studio assert macros, including static assertion static_assert and so on. There are two kinds of assertions that can be used in the C++ standard Category 03:

◆ uses conditional compilation and # error directives in preprocessing to check some compilation conditions during the preprocessing phase.

◆ can use Visual Studio assert macros for run-time checking to ensure the correctness of program logic

However, using the # error method is very tedious, and template parameters cannot be checked because the template instantiation occurs at compile time, while the # error method occurs during the preprocessing phase. Visual Studio assert macros are checked at run time. It is not difficult to find that one thing we are missing is the tool that can be used to check at compile time. As a result, static assertions emerge as the times require.

In the new C++ standard "static assertion 0x", support for static assertions is added and a new keyword static_assert is introduced to express static assertions. Using static assertions, we can detect whether some conditions are true at compile time of the program, which is especially useful when debugging template parameters of template functions. At compile time, the template function is instantiated, and we can use static assertions to test whether the parameters of the template function have the appropriate values according to our design. For example, the following code:

Template struct Kitten {static_assert (N < 2, "Kitten requires N < 2.");}; int main () {Kitten peppermint; Kitten jazz; return 0;}

When we use "1" in the main function to instantiate the Kitten structure, when compiling, the static assertion static_assert will test the value of the parameter N, when the value of N is less than 2, it will generate an assertion error, and output the corresponding debugging help information to the "Error List" window, so that the programmer can quickly locate the problem and solve the problem more easily.

In addition, static assertions bring many other advantages. For example, static assertions are processed at compile time without any runtime space and time overhead, which makes it more efficient than Visual Studio assert macros. Another important feature is that if the assertion fails, it will generate meaningful and sufficient diagnostic information to help programmers solve the problem quickly.

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