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Daniel Boles authored
Add another way to produce formatted ustrings, this time using printf syntax, by forwarding arguments to g_strdup_printf() and then copying the result into the returned ustring. This includes a private ustring::sprintify() function that by default just forward its argument but can be overloaded to do something else. In this commit, that is overloaded for ustring and std::string so that their .c_str() is passed to printf instead, avoiding the ugliness of users always having to write .c_str() in their own lists of arguments. Note that the same lack of type safety as plagues printf() and all its variants (in both C and GLib) applies here: the arguments are just forwarded on, so if you include too few or the wrong types for the placeholders you specify, you invoke undefined behaviour just as in C. For reasons like that, C++'s preference of streams over stdio, and the hope that we'll eventually get an actual nice string-formatting solution in the C++ Standard, I don't go out of my way to shout about this in the documentation. Users who really want sprintf() will find it, without us having to shout too loudly about it and risk being seen as recommending it more than anything else. It's here for those who know they need it. #21
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