Julia truncate用法及代码示例

truncate(file, n)

将第一个参数给定的文件或缓冲区大小调整为正好 n 字节，如果文件或缓冲区增长，则用 '\0' 填充先前未分配的空间。

例子

julia> io = IOBuffer();

julia> write(io, "JuliaLang is a GitHub organization.")
35

julia> truncate(io, 15)
IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=15, maxsize=Inf, ptr=16, mark=-1)

julia> String(take!(io))
"JuliaLang is a "

julia> io = IOBuffer();

julia> write(io, "JuliaLang is a GitHub organization.");

julia> truncate(io, 40);

julia> String(take!(io))
"JuliaLang is a GitHub organization.\0\0\0\0\0"