From Cppreference
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| typedef /*implementation defined*/ openmode;
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static constexpr openmode app = /*implementation defined*/
static constexpr openmode binary = /*implementation defined*/
static constexpr openmode in = /*implementation defined*/
static constexpr openmode out = /*implementation defined*/
static constexpr openmode trunc = /*implementation defined*/
static constexpr openmode ate = /*implementation defined*/
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Specifies available file open flags. It is a bitmask type, the following constants are defined:
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| Constant
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Explanation
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| app
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seek to the end of stream before each write
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| binary
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open in binary mode
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| in
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open for reading
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| out
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open for writing
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| trunc
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discard the contents of the stream when opening
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| ate
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seek to the end of stream immediately after open
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[edit] Example