fmt

来源： https://stackoverflow.com/questions/61561306/c20-support-in-visual-studio

来源： https://stackoverflow.com/questions/54839414/why-is-fmt-library-not-found-after-installing-fmt-and-gcc-compiler-with-brew

问题 C++20 introduces std::format . What are the advantages over printf or std::cout . How can I use it and someone give an example of it? 回答1: What are the advantages over printf Type safety. For printf, the programmer must carefully match the format specifier to the type of the argument. If they make a mistake, the behaviour of the program is undefined. This is a very common source of bugs, especially for beginners. To be fair, decent compilers diagnose these mistakes as long as a constant

问题 I'm trying to use the fmt (https://github.com/fmtlib/fmt) formatting header library in my c++ project. I've added the path to the core header file at the top of my main file like so: #include "../third_party/fmt/core.h" but when I try to call any function like: string message = fmt::format("The answer is {}", 42); I get the following error: Undefined symbols for architecture x86_64: "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > fmt::v5::internal:

问题 I've downloaded, built and added to the project the {fmt} 6.2.1 library on c++. I'm using Windows. Problem is, the headers are recognized(Code:Blocks give me the auto-completion for them) but any function I try to use results in errors. For example this code: #include <iostream> #include<fmt-6.1.2/include/fmt/core.h> #include<fmt-6.1.2/include/fmt/format.h> int main() { auto msg1 = fmt::format("The answer is {}", 42); return 0; } produces this error ||=== Build: Debug in test libreria fmt