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Return Type
Return Type返回类型
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Operation
Operation操作
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Type
Type类型
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Expression
Expression表达式
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Valid expressions
Valid expressions有效表达式
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* `m` is an instance of [link beast.ref.boost__beast__file_mode `file_mode`]
* `n` is a number of bytes, convertible to `std::size_t`
* `o` is a byte offset in the file, convertible to `std::uint64_t`
* `b` is any non-const pointer to memory
* `c` is any possibly-const pointer to memory
* `ec` is a reference of type [link beast.ref.boost__beast__error_code `error_code`]
* `m` is an instance of是一个 [link beast.ref.boost__beast__file_mode `file_mode`] 的实例。
* `n` is a number of bytes, convertible to是字节数，可转换为 `std::size_t` 类型。
* `o` is a byte offset in the file, convertible to是文件中的字节偏移量，可转换为 `std::uint64_t` 类型。
* `b` is any non-const pointer to memory
* `c` is any possibly-const pointer to memory
* `ec` is a reference of type是指向内存的任意非常量指针。
* `c` 是指向内存的任意可能为常量的指针。
* `ec` 是一个 [link beast.ref.boost__beast__error_code `error_code`] 类型的引用。
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* `F` is a [*File] type
* `f` is an instance of `F`
* `p` is a value of type `char const*` which points to a null
* `F` 是一个 [*File] 类型。
* `f` 是 `F` 的一个实例。
* `p` 是一个 `char const*` 类型的值，指向一个空字符（null）……

（注：您提供的英文原文似乎被截断了，完整表述通常为 "points to a null-terminated string"，即“指向一个以空字符结尾的字符串”。）
06/18/2026
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* `F` is a [*File] type
* `f` is an instance of `F`
* `p` is a value of type `char const*` which points to a null
* `F` is a是一个 [*File] type类型。
* `f` is an instance of `F`
* `p` is a value of type `char const*` which points to a null是 `F` 的一个实例。
* `p` 是一个 `char const*` 类型的值，指向一个空字符（null）……

（注：您提供的英文原文似乎被截断了，完整表述通常为 "points to a null-terminated string"，即“指向一个以空字符结尾的字符串”。）
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In this table:
In this table:在下表中：
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Requirements
Requirements要求
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* [link beast.ref.boost__beast__file_mode `file_mode`]
* [link beast.ref.boost__beast__is_file `is_file`]
* [link beast.ref.boost__beast__file_mode `file_mode`]
* [link beast.ref.boost__beast__is_file `is_file`]
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Associated Types
Associated Types关联类型
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The [*File] concept abstracts access to files in the underlying file system. To support other platform interfaces, users may author their own [*File] types which meet these requirements.
The [*File] concept abstracts access to files in the underlying file system. To support other platform interfaces, users may author their own [*File] types which meet these requirements.概念抽象了对底层文件系统中文件的访问。为了支持其他平台接口，用户可以编写满足这些要求的自有 [*File] 类型。
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File
File文件
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* [link beast.ref.boost__beast__http__basic_fields.writer `basic_fields::writer`]
* [link beast.ref.boost__beast__http__basic_fields.writer `basic_fields::writer`]
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Models
Models模型
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Exemplar
Exemplar示例
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Called once after construction, this function returns a constant buffer sequence containing the serialized representation of the HTTP request or response including the final carriage return linefeed sequence (`"\r\n"`).

Copies may be made of the returned sequence, but the underlying memory is still owned by the writer. The implementation will destroy all copies of the buffer sequence before destroying `a`.
Called once after construction, this function returns a constant buffer sequence containing the serialized representation of the HTTP request or response including the final carriage return linefeed sequence (`"\r\n"`).

Copies may be made of the returned sequence, but the underlying memory is still owned by the writer. The implementation will destroy all copies of the buffer sequence before destroying `a`.该函数在构造后仅被调用一次，用于返回一个常量缓冲区序列。该序列包含 HTTP 请求或响应的序列化表示，以及最终的换行回车序列（"\r\n"）。

返回的序列可以被拷贝，但底层内存仍由该写入器持有。实现会在销毁该对象 `a` 之前，销毁该缓冲区序列的所有拷贝。
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`a.get()`
`a.get()`
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The implementation calls this constructor to indicate that the fields being serialized form part of a chunked encoding final-chunk trailer. The lifetime of `f` is guaranteed to end no earlier than after the `W` is destroyed.
The implementation calls this constructor to indicate that the fields being serialized form part of a chunked encoding final-chunk trailer. The lifetime of `f` is guaranteed to end no earlier than after the `W` is destroyed.实现调用该构造函数，用于表示正在序列化的字段属于分块传输编码的最终块尾部。该对象 `f` 的生命周期保证在 `W` 销毁之后才会结束。
06/18/2026

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