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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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11
Task/Call-a-function-in-a-shared-library/Crystal/call-a-function-in-a-shared-library.crystal Normal file
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libm = LibC.dlopen("libm.so.6", LibC::RTLD_LAZY)
sqrtptr = LibC.dlsym(libm, "sqrt") unless libm.null?
if sqrtptr
sqrtproc = Proc(Float64, Float64).new sqrtptr, Pointer(Void).null
at_exit { LibC.dlclose(libm) }
else
sqrtproc = ->Math.sqrt(Float64)
end
puts "the sqrt of 4 is #{sqrtproc.call(4.0)}"