flatbuffers/samples/sample_binary.cpp at master · google/flatbuffers · GitHub

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* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

#include "monster_generated.h" // Already includes "flatbuffers/flatbuffers.h".

using namespace MyGame::Sample;

// Example how to use FlatBuffers to create and read binary buffers.

int main(int /*argc*/, const char* /*argv*/[]) {

// Build up a serialized buffer algorithmically:

flatbuffers::FlatBufferBuilder builder;

// First, lets serialize some weapons for the Monster: A 'sword' and an 'axe'.

auto weapon_one_name = builder.CreateString("Sword");

short weapon_one_damage = 3;

auto weapon_two_name = builder.CreateString("Axe");

short weapon_two_damage = 5;

// Use the `CreateWeapon` shortcut to create Weapons with all fields set.

auto sword = CreateWeapon(builder, weapon_one_name, weapon_one_damage);

auto axe = CreateWeapon(builder, weapon_two_name, weapon_two_damage);

// Create a FlatBuffer's `vector` from the `std::vector`.

std::vector<flatbuffers::Offset<Weapon>> weapons_vector;

weapons_vector.push_back(sword);

weapons_vector.push_back(axe);

auto weapons = builder.CreateVector(weapons_vector);

// Second, serialize the rest of the objects needed by the Monster.

auto position = Vec3(1.0f, 2.0f, 3.0f);

auto name = builder.CreateString("MyMonster");

unsigned char inv_data[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};

auto inventory = builder.CreateVector(inv_data, 10);

// Shortcut for creating monster with all fields set:

auto orc = CreateMonster(builder, &position, 150, 80, name, inventory,

Color_Red, weapons, Equipment_Weapon, axe.Union());

builder.Finish(orc); // Serialize the root of the object.

// We now have a FlatBuffer we can store on disk or send over a network.

// ** file/network code goes here :) **

// access builder.GetBufferPointer() for builder.GetSize() bytes

// Instead, we're going to access it right away (as if we just received it).

// Get access to the root:

auto monster = GetMonster(builder.GetBufferPointer());

// Get and test some scalar types from the FlatBuffer.

assert(monster->hp() == 80);

assert(monster->mana() == 150); // default

assert(monster->name()->str() == "MyMonster");

// Get and test a field of the FlatBuffer's `struct`.

auto pos = monster->pos();

assert(pos);

assert(pos->z() == 3.0f);

(void)pos;

// Get a test an element from the `inventory` FlatBuffer's `vector`.

auto inv = monster->inventory();

assert(inv);

assert(inv->Get(9) == 9);

(void)inv;

// Get and test the `weapons` FlatBuffers's `vector`.

std::string expected_weapon_names[] = {"Sword", "Axe"};

short expected_weapon_damages[] = {3, 5};

auto weps = monster->weapons();

for (unsigned int i = 0; i < weps->size(); i++) {

assert(weps->Get(i)->name()->str() == expected_weapon_names[i]);

assert(weps->Get(i)->damage() == expected_weapon_damages[i]);

}

(void)expected_weapon_names;

(void)expected_weapon_damages;

// Get and test the `Equipment` union (`equipped` field).

assert(monster->equipped_type() == Equipment_Weapon);

auto equipped = static_cast<const Weapon*>(monster->equipped());

assert(equipped->name()->str() == "Axe");

assert(equipped->damage() == 5);

(void)equipped;

printf("The FlatBuffer was successfully created and verified!\n");

}

flatbuffers/samples/sample_binary.cpp at master · google/flatbuffers · GitHub

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