c++ - ifstream a file which another program is writing to? -

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what happens when try open file using std::ifstream while file being written application?

that depends on sharing mode used open file in other program. if open mode use compatible sharing mode, you'll open file. otherwise, open fail. c++ doesn't offer "sharing modes," though, sharing modes whatever vendor's implementation happens use. if really want control on how open file, use os-provided functions (createfile, in case).

as writes other program take effect, you'll able read them in program. if write file, writes , other program's writes might interfere each other, causing data loss or jumbled output; don't that.


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