boost – Make Me Engineer

C++ & Boost: encode/decode UTF-8

Thanks everyone, but ultimately I resorted to http://utfcpp.sourceforge.net/ — it’s a header-only library that’s very lightweight and easy to use. I’m sharing a demo code here, should anyone find it useful: inline void decode_utf8(const std::string& bytes, std::wstring& wstr) { utf8::utf8to32(bytes.begin(), bytes.end(), std::back_inserter(wstr)); } inline void encode_utf8(const std::wstring& wstr, std::string& bytes) { utf8::utf32to8(wstr.begin(), wstr.end(), std::back_inserter(bytes)); } … Read more

BOOST_STATIC_ASSERT without boost

One other trick (which can be used in C) is to try to build an array with a negative size if the assert fail: #define ASSERT(cond) int foo[(cond) ? 1 : -1] as a bonus, you may use a typedef instead of an object, so that it is usable in more contexts and doesn’t takes … Read more

how do you make a heterogeneous boost::map?

#include <map> #include <string> #include <iostream> #include <boost/any.hpp> int main() { try { std::map<std::string, boost::any> m; m[“a”] = 2; m[“b”] = static_cast<char const *>(“black sheep”); int i = boost::any_cast<int>(m[“a”]); std::cout << “I(” << i << “)\n”; int j = boost::any_cast<int>(m[“b”]); // throws exception std::cout << “J(” << j << “)\n”; } catch(…) { std::cout << … Read more

xcode with boost : linker(Id) Warning about visibility settings

If boost is included by multiple projects, each project must have the same values for Symbols Hidden by Default Inline Methods Hidden

Which C++ signals/slots library should I choose? [closed]

First, try with boost::signal anyway. Don’t assume it will not be fast enough until you try in your specific case that is your application If it’s not efficient enough, maybe something like FastDelegate will suit your needs? (i did’nt try it but heard it was a nice solution in some cases where boost::signal don’t seem … Read more

Copy a streambuf’s contents to a string

I don’t know whether it counts as “excessive copying“, but you can use a stringstream: std::ostringstream ss; ss << someStreamBuf; std::string s = ss.str(); Like, to read everything from stdin into a string, do std::ostringstream ss; ss << std::cin.rdbuf(); std::string s = ss.str(); Alternatively, you may also use a istreambuf_iterator. You will have to measure … Read more

Using boost thread and a non-static class function

The this keyword is used with boost::bind when the function object you’re creating is bound to a object member function. Member functions can’t exist apart from instances, so when creating a functor object out of a member function with boost::bind, you need a pointer to an instance. That’s exactly what the this keyword actually is. … Read more

C++ Boost: what’s the cause of this warning?

It is nothing to worry about. In the last few releases of MSVC, they’ve gone into full security-paranoia mode. std::copy issues this warning when it is used with raw pointers, because when used incorrectly, it can result in buffer overflows. Their iterator implementation performs bounds checking to ensure this doesn’t happen, at a significant performance … Read more

Official “Boost library” Support for Android and iOS? [closed]

Got reply from boost community Yes. These platforms are not officially supported because no one has volunteered to run regression tests regularly for them. It is not possible for a Boost developer to test on all platforms. So developers depend on the test results of regression tests run by volunteers. For example, see http://beta.boost.org/development/tests/trunk/developer/summary.html If … Read more

Does delete work with pointers to base class?

Yes, it will work, if and only if the base class destructor is virtual, which you have done for the Base base class but not for the IFoo base class. If the base class destructor is virtual, then when you call operator delete on the base class pointer, it uses dynamic dispatch to figure out … Read more

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