Implementation:Alibaba MNN FlatBuffers Base Header

Knowledge Sources	Alibaba_MNN FlatBuffers
Domains	Serialization, Platform_Abstraction
Last Updated	2026-02-10 12:00 GMT

Overview

Foundational header providing platform detection, endianness handling, and basic type definitions for the FlatBuffers library.

Description

base.h is the lowest-level header in the vendored FlatBuffers library. It detects the target platform and compiler, defines endianness conversion macros, and establishes fundamental types (such as uoffset_t, soffset_t, and voffset_t) used throughout the serialization framework. All other FlatBuffers headers depend on this file.

Usage

Vendored dependency used internally by MNN for model serialization. Not directly imported by end users.

Code Reference

Source Location

• Repository: Alibaba_MNN
• File: 3rd_party/flatbuffers/include/flatbuffers/base.h
• Lines: 1-331

Signature

typedef uint32_t uoffset_t;
typedef int32_t soffset_t;
typedef uint16_t voffset_t;
template<typename T> T EndianSwap(T t);
#define FLATBUFFERS_LITTLEENDIAN 1

Import

#include "flatbuffers/base.h"

I/O Contract

Input	Output
Compiler/platform preprocessor defines	Normalized type aliases, endianness macros, and static assertions

Usage Examples

#include "flatbuffers/base.h"

// Use fundamental offset types
flatbuffers::uoffset_t offset = 0;
flatbuffers::voffset_t field_offset = 4;

// Endian conversion
uint32_t val = flatbuffers::EndianSwap(0x01020304);

Related Pages

• Environment:Alibaba_MNN_CPU_Build_Environment