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gcc 6.3.0

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C++14
no pedantic

ArduinoJson.h
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// ArduinoJson - arduinojson.org
// Copyright Benoit Blanchon 2014-2018
// MIT License
//
// This example shows how to generate a JSON document with ArduinoJson.

#include <iostream>
#include "ArduinoJson.h"

int main()
{
// The JSON document
//
// Inside the brackets, 200 is the RAM allocated to this document.
// Don't forget to change this value to match your requirement.
// Use arduinojson.org/assistant to compute the capacity.
StaticJsonDocument<200> doc;

// StaticJsonObject allocates memory on the stack, it can be
// replaced by DynamicJsonDocument which allocates in the heap.
//
// DynamicJsonDocument doc(200);

// Make our document be an object
JsonObject root = doc.to<JsonObject>();

// Add values in the object
//
// Most of the time, you can rely on the implicit casts.
// In other case, you can do root.set<long>("time", 1351824120);
root["sensor"] = "gps";
root["time"] = 1351824120;

// Add an array.
//
JsonArray data = root.createNestedArray("data");
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// ArduinoJson - arduinojson.org
// Copyright Benoit Blanchon 2014-2018
// MIT License

#pragma once

#ifdef __cplusplus

#define ARDUINOJSON_VERSION "6.2.3-beta"
#define ARDUINOJSON_VERSION_MAJOR 6
#define ARDUINOJSON_VERSION_MINOR 2
#define ARDUINOJSON_VERSION_REVISION 3
#include <stddef.h> // for size_t
#include <stdint.h> // for uint8_t
#include <string.h>
#ifndef ARDUINOJSON_EMBEDDED_MODE
#if defined(ARDUINO) || defined(__IAR_SYSTEMS_ICC__) || defined(__XC) || \
defined(__ARMCC_VERSION)
#define ARDUINOJSON_EMBEDDED_MODE 1
#else
#define ARDUINOJSON_EMBEDDED_MODE 0
#endif
#endif
#if ARDUINOJSON_EMBEDDED_MODE
#ifndef ARDUINOJSON_USE_DOUBLE
#define ARDUINOJSON_USE_DOUBLE 0
#endif
#ifndef ARDUINOJSON_USE_LONG_LONG
#define ARDUINOJSON_USE_LONG_LONG 0
#endif
#ifndef ARDUINOJSON_USE_INT64
#define ARDUINOJSON_USE_INT64 0
#endif
#ifndef ARDUINOJSON_ENABLE_STD_STRING
#define ARDUINOJSON_ENABLE_STD_STRING 0
#endif

$ g++ prog.cc -Wall -Wextra -std=c++14 
{"sensor":"gps","time":1351824120,"data":[48.75608]}
{
  "sensor": "gps",
  "time": 1351824120,
  "data": [
    48.75608
  ]
}
Exit Code:
0