90d6f8bf62
libglim is an Apache-licensed C++ wrapper for lmdb, and rather than rolling our own it seems prudent to use it. Note: lmdb is not included in it, and unless something happens as did with libunbound, should be installed via each OS' package manager or equivalent.
35 lines
1.3 KiB
C++
35 lines
1.3 KiB
C++
#include <functional>
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namespace glim {
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// http://stackoverflow.com/questions/2121607/any-raii-template-in-boost-or-c0x/
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/// RAII helper. Keeps the functor and runs it in the destructor.
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/// Example: \code auto unmap = raiiFun ([&]() {munmap (fd, size);}); \endcode
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template<typename Fun> struct RAIIFun {
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Fun _fun;
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RAIIFun (RAIIFun&&) = default;
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RAIIFun (const RAIIFun&) = default;
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template<typename FunArg> RAIIFun (FunArg&& fun): _fun (std::forward<Fun> (fun)) {}
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~RAIIFun() {_fun();}
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};
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/// The idea to name it `finally` comes from http://www.codeproject.com/Tips/476970/finally-clause-in-Cplusplus.
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/// Example: \code finally unmap ([&]() {munmap (fd, size);}); \endcode
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typedef RAIIFun<std::function<void(void)>> finally;
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/// Runs the given functor when going out of scope.
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/// Example: \code
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/// auto closeFd = raiiFun ([&]() {close (fd);});
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/// auto unmap = raiiFun ([&]() {munmap (fd, size);});
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/// \endcode
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template<typename Fun> RAIIFun<Fun> raiiFun (const Fun& fun) {return RAIIFun<Fun> (fun);}
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/// Runs the given functor when going out of scope.
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/// Example: \code
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/// auto closeFd = raiiFun ([&]() {close (fd);});
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/// auto unmap = raiiFun ([&]() {munmap (fd, size);});
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/// \endcode
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template<typename Fun> RAIIFun<Fun> raiiFun (Fun&& fun) {return RAIIFun<Fun> (std::move (fun));}
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}
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