implement #30151, accept filename in (de)serialize

NEWS.md

@@ -63,6 +63,7 @@ Standard library changes
   * `randperm` and `randcycle` now use the type of their argument to determine the element type of
     the returned array ([#29670]).
   * A new method `rand(::Tuple)` implements sampling from the values of a tuple ([#25278]).
+  * `serialize` and `deserialize` now accept a filename argument, like `write` and `read` ([#30151]).
 
 Compiler/Runtime improvements
 -----------------------------

stdlib/Serialization/src/Serialization.jl

@@ -694,6 +694,16 @@ function serialize(s::IO, x)
     serialize(ss, x)
 end
 
+"""
+    serialize(filename::AbstractString, value)
+
+Open a file and serialize the given value to it.
+
+!!! compat "Julia 1.1"
+    This method is available as of Julia 1.1.
+"""
+serialize(filename::AbstractString, x) = open(io->serialize(io, x), filename, "w")
+
 ## deserializing values ##
 
 """
@@ -707,6 +717,16 @@ the integrity and correctness of data read from `stream`.
 """
 deserialize(s::IO) = deserialize(Serializer(s))
 
+"""
+    deserialize(filename::AbstractString)
+
+Open a file and deserialize its contents.
+
+!!! compat "Julia 1.1"
+    This method is available as of Julia 1.1.
+"""
+deserialize(filename::AbstractString) = open(deserialize, filename)
+
 function deserialize(s::AbstractSerializer)
     handle_deserialize(s, Int32(read(s.io, UInt8)::UInt8))
 end

stdlib/Serialization/test/runtests.jl

@@ -532,3 +532,10 @@ let io = IOBuffer()
     f2 = deserialize(io)
     @test f2(1) === 1f0
 end
+
+# using a filename; #30151
+let f = tempname(), x = [rand(2,2), :x, "hello"]
+    serialize(f, x)
+    @test deserialize(f) == x
+    rm(f)
+end