circular dependency in C++ when generate cpprest client

I use the OpenAPI Spec files to generate cpprest client. Codes are generated successfully.
But the compilation failed because Teacher_instance.h is included in Student_instance.h and Student_instance.h is included in Teacher_instance.h.
How can I solve the problem?

{
  "swagger": "2.0",
  "info": {
    "title": "Test",
    "description": "Test",
    "version": "1.0.0.0",
    "license": {
      "name": "End User License Agreement",
      "url": "/branding/locales/en-US/eula.txt"
    }
  },
  "host": "127.0.0.1",
  "tags": [
    {
      "description": "student",
      "name": "student"
    },
    {
      "description": "teacher",
      "name": "teacher"
    }],
  "paths": {
    "/student": {
      "get": {
        "tags": [
          "student"
        ],
        "summary": "Find student",
        "description": "Query the student",
        "responses": {
          "200": {
            "description": "Success",
            "schema": {
              "type": "array",
              "items": {
                "$ref": "#/definitions/student_instance"
              }
            }
          }
        }
      }
    },
    "/teacher": {
      "get": {
        "tags": [
          "teacher"
        ],
        "summary": "Find teacher",
        "description": "Query the teacher",
        "responses": {
          "200": {
            "description": "Success",
            "schema": {
              "type": "array",
              "items": {
                "$ref": "#/definitions/teacher_instance"
              }
            }
          }
        }
      }
    }
  },
  "definitions": {
    "student_instance" : {
     "description": "Properties of a student.",
      "type": "object",
      "properties": {
        "id": {
          "description": "Unique identifier of the student.",
          "type": "string"
        },
        "name": {
          "description": "Name of the student.",
          "type": "string",
          "x-case-insensitive": true
        },
        "teacher": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/teacher_instance"
          },
          "description": "teachers of the student."
        }
      }
    },
    "teacher_instance" : {
      "description": "Properties of a teacher.",
      "type": "object",
      "properties": {
        "id": {
          "description": "Unique identifier of the teacher.",
          "type": "string"
        },
        "name": {
          "description": "Name of the teacher.",
          "type": "string"
        },
        "student": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/student_instance"
          },
          "description": "students of the teacher."
        }
      }
    }
  }
}

Reproduce the generated cpprest client from the supplied OpenAPI document and inspect Student_instance.h and Teacher_instance.h, which include each other. Determine how the generator handles these mutually referenced models; done means the generated client compiles without the circular include failure.