You need to rebuild boost using clang++ -stdlib=libc++. libc++ is not binary compatible with gcc’s libstdc++ (except for some low level stuff such as operator new). For example the std::string in gcc’s libstdc++ is refcounted, whereas in libc++ it uses the “short string optimization”. If you were to accidentally mix these two strings in the … Read more
All modern terminal emulators use ANSI escape codes to show colours and other things. Don’t bother with libraries, the code is really simple. More info is here. Example in C: #include <stdio.h> #define ANSI_COLOR_RED “\x1b[31m” #define ANSI_COLOR_GREEN “\x1b[32m” #define ANSI_COLOR_YELLOW “\x1b[33m” #define ANSI_COLOR_BLUE “\x1b[34m” #define ANSI_COLOR_MAGENTA “\x1b[35m” #define ANSI_COLOR_CYAN “\x1b[36m” #define ANSI_COLOR_RESET “\x1b[0m” int main … Read more
Here are some examples of std::unique_ptr with incomplete types. The problem lies in destruction. If you use pimpl with unique_ptr, you need to declare a destructor: class foo { class impl; std::unique_ptr<impl> impl_; public: foo(); // You may need a def. constructor to be defined elsewhere ~foo(); // Implement (with {}, or with = default;) … Read more
You are correct in that glibc uses symbol versioning. If you are curious, the symbol versioning implementation introduced in glibc 2.1 is described here and is an extension of Sun’s symbol versioning scheme described here. One option is to statically link your binary. This is probably the easiest option. You could also build your binary … Read more
The libc++ basic_string is designed to have a sizeof 3 words on all architectures, where sizeof(word) == sizeof(void*). You have correctly dissected the long/short flag, and the size field in the short form. what value would __min_cap, the capacity of short strings, take for different architectures? In the short form, there are 3 words to … Read more
If your task is not to invent the line-by-line reading function, but just to read the file line-by-line, you may use a typical code snippet involving the getline() function (see the manual page here): #define _GNU_SOURCE #include <stdio.h> #include <stdlib.h> int main(void) { FILE * fp; char * line = NULL; size_t len = 0; … Read more