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I want to use the new C++20 <format> header. But when I try to #include it, it apparently doesn't exist in my current stdlib.
I tried using clang++ and g++, but neither of them work.
Yes, I specified the C++ standard to be "c++2a" in the tasks.json file in VSCode.
What am I doing wrong?
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You make the declarations in a header file, then use the #include directive in every . cpp file or other header file that requires that declaration. The #include directive inserts a copy of the header file directly into the . cpp file prior to compilation.
Clang doesn't use C++20 by default, so you must specify it explicitly. Clang uses libstdc++ standard library on Linux by default (for compatibility with shared libraries), so in such case you won't be using the Clang's standard library by default, and libstdc++ hasn't implemented text formatting yet.
In C++ program has the header file which stands for input and output stream used to take input with the help of “cin” and “cout” respectively. There are of 2 types of header file: Pre-existing header files: Files which are already available in C/C++ compiler we just need to import them.
Why Do You Use Header Files? Header files are used in C++ so that you don't have to write the code for every single thing. It helps to reduce the complexity and number of lines of code. It also gives you the benefit of reusing the functions that are declared in header files to different .
You can view an overview of compiler support here: https://en.cppreference.com/w/cpp/compiler_support
According to the table, up to today (May 13 '20 at 8:07) no compiler supports P0645R10: Text formatting.
The overview specifically for MSVS can be found here: https://learn.microsoft.com/en-us/cpp/overview/visual-cpp-language-conformance?view=vs-2019 (though I didn't find <format> on their list).
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