86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
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#pragma once
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#if __has_include(<dlfcn.h>)
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#include <dlfcn.h>
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#include <cassert>
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namespace libremidi
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{
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class dylib_loader
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{
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public:
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explicit dylib_loader(const char* const so)
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{
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impl = dlopen(so, RTLD_LAZY | RTLD_LOCAL | RTLD_NODELETE);
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}
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dylib_loader(const dylib_loader&) noexcept = delete;
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dylib_loader& operator=(const dylib_loader&) noexcept = delete;
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dylib_loader(dylib_loader&& other) noexcept
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{
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impl = other.impl;
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other.impl = nullptr;
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}
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dylib_loader& operator=(dylib_loader&& other) noexcept
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{
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impl = other.impl;
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other.impl = nullptr;
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return *this;
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}
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~dylib_loader()
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{
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if (impl)
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{
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dlclose(impl);
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}
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}
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template <typename T>
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T symbol(const char* const sym) const noexcept
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{
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assert(impl);
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return reinterpret_cast<T>(dlsym(impl, sym));
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}
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operator bool() const noexcept { return bool(impl); }
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private:
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void* impl{};
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};
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}
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#define LIBREMIDI_SYMBOL_NAME_S(prefix, name) #prefix "_" #name
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#define LIBREMIDI_SYMBOL_NAME(prefix, name) prefix##_##name
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#define LIBREMIDI_SYMBOL_DEF(prefix, name) \
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decltype(&::LIBREMIDI_SYMBOL_NAME(prefix, name)) name{};
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#define LIBREMIDI_SYMBOL_INIT(prefix, name) \
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{ \
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name = library.symbol<decltype(&::LIBREMIDI_SYMBOL_NAME(prefix, name))>( \
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LIBREMIDI_SYMBOL_NAME_S(prefix, name)); \
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if (!name) \
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{ \
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available = false; \
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return; \
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} \
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}
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// Because some libs have names that are C++ keywords, e.g. udev_new:
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#define LIBREMIDI_SYMBOL_NAME2_S(prefix, name, varname) #prefix "_" #name
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#define LIBREMIDI_SYMBOL_NAME2(prefix, name, varname) prefix##_##name
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#define LIBREMIDI_SYMBOL_DEF2(prefix, name, varname) \
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decltype(&::LIBREMIDI_SYMBOL_NAME2(prefix, name, varname)) varname{};
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#define LIBREMIDI_SYMBOL_INIT2(prefix, name, varname) \
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{ \
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varname = library.symbol<decltype(&::LIBREMIDI_SYMBOL_NAME2(prefix, name, varname))>( \
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LIBREMIDI_SYMBOL_NAME2_S(prefix, name, varname)); \
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if (!varname) \
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{ \
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available = false; \
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return; \
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} \
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}
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#endif
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