error: ‘bag’ does not name a type

edit

I have added rosbag dependencies in cmakefile.txt and package.xml and included essential ros headers but still catkin_make shows errors ( this not name a type that not name a type). Please help i really dont understand whats going wrong.

i have copied file from this ros tutorial : (http://wiki.ros.org/rosbag/Code%20API)

Make Error :

 error: ‘bag’ does not name a type
 bag.open("~/bagfiles/2016-12-20-18-18-30.bag", rosbag::bagmode::Read);
 ^
/home/mandeep/catkin_ws/src/proto1/proto1_moveit/src/rosplay.cpp:11:1: error: ‘topics’ does not name a type
 topics.push_back(std::string("chatter"));
 ^
/home/mandeep/catkin_ws/src/proto1/proto1_moveit/src/rosplay.cpp:12:1: error: ‘topics’ does not name a type
 topics.push_back(std::string("numbers"));
 ^
/home/mandeep/catkin_ws/src/proto1/proto1_moveit/src/rosplay.cpp:16:2: error: expected unqualified-id before ‘if’
 foreach(rosbag::MessageInstance const m, view)
  ^
/home/mandeep/catkin_ws/src/proto1/proto1_moveit/src/rosplay.cpp:16:44: error: expected unqualified-id before ‘else’
 foreach(rosbag::MessageInstance const m, view)
                                            ^
/home/mandeep/catkin_ws/src/proto1/proto1_moveit/src/rosplay.cpp:16:897: error: expected unqualified-id before ‘else’
 foreach(rosbag::MessageInstance const m, view)

rosplay.cpp

#include <rosbag/bag.h>
#include <rosbag/view.h>

#include <boost/foreach.hpp>
#define foreach BOOST_FOREACH

rosbag::Bag bag;
bag.open("~/bagfiles/2016-12-20-18-18-30.bag", rosbag::bagmode::Read);

std::vector<std::string> topics;
topics.push_back(std::string("chatter"));
topics.push_back(std::string("numbers"));

rosbag::View view(bag, rosbag::TopicQuery(topics));

foreach(rosbag::MessageInstance const m, view)
{
    std_msgs::String::ConstPtr s = m.instantiate<std_msgs::String>();
    if (s != NULL)
        ASSERT_EQ(s->data, std::string("foo"));

    std_msgs::Int32::ConstPtr i = m.instantiate<std_msgs::Int32>();
    if (i != NULL)
        ASSERT_EQ(i->data, 42);
}

bag.close();

There goes my Cmakefiles.txt : Highlighted part added for rosplay.cpp

cmake_minimum_required(VERSION 2.8.3)
project(proto1_moveit)

set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/cmake-modules)  ####CHANGE
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)  ####CHANGE
set(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/lib)  ####CHANGE

find_package(catkin REQUIRED COMPONENTS
             moveit_core
             moveit_ros_planning
             moveit_ros_planning_interface
             pluginlib
             rosbag
             cmake_modules
             geometric_shapes
             joint_trajectory_controller
             joint_trajectory_action
             moveit_simple_controller_manager
             industrial_robot_simulator
             actionlib
             actionlib_msgs
             control_msgs
             trajectory_msgs
             moveit_msgs
             shape_msgs
             chef_arm_kinematics
)

find_package(MySqlClient REQUIRED) ###CHANGE

find_package(Boost REQUIRED system filesystem date_time thread)

find_package(Eigen REQUIRED)
include_directories(SYSTEM ${Boost_INCLUDE_DIR} ${EIGEN_INCLUDE_DIRS} ${catkin_INCLUDE_DIRS})

include_directories(${MYSQL_INCLUDE_DIRS}) ###CHANGE

catkin_package(
  INCLUDE_DIRS 
    include
  LIBRARIES 
    ik_utils_proto
    pick_proto
    place_proto
    dispense_proto
    stir_proto
  CATKIN_DEPENDS 
    rosbag
    moveit_core
    moveit_ros_planning_interface
    interactive_markers
    std_msgs
    actionlib_msgs
    shape_msgs
    chef_arm_kinematics
)

add_definitions(${MYSQL_DEFINITIONS}) ##CHANGE

add_library(pick_proto src/pick_proto.cpp) 
target_link_libraries(pick_proto ${catkin_LIBRARIES} ${Boost_LIBRARIES} ${MYSQL_LIBRARIES}) ###CHANGE
install(TARGETS pick_proto
  ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
  LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
  RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
)
add_library(place_proto src/place_proto.cpp) 
target_link_libraries(place_proto ${catkin_LIBRARIES} ${Boost_LIBRARIES} ${MYSQL_LIBRARIES}) ###CHANGE
install(TARGETS place_proto
  ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
  LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
  RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
)
add_library(dispense_proto src/dispense_proto.cpp) 
target_link_libraries(dispense_proto ${catkin_LIBRARIES} ${Boost_LIBRARIES} ${MYSQL_LIBRARIES}) ###CHANGE
install(TARGETS dispense_proto
  ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
  LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
  RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
)
add_library(stir_proto src/stir_proto.cpp) 
target_link_libraries(stir_proto ${catkin_LIBRARIES} ${Boost_LIBRARIES} ${MYSQL_LIBRARIES}) ###CHANGE
install(TARGETS stir_proto
  ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
  LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
  RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
)
add_executable(environment_proto src/environment_proto.cpp)
target_link_libraries(environment_proto ${catkin_LIBRARIES} ${Boost_LIBRARIES} ${MYSQL_LIBRARIES}) ###CHANGE
install(TARGETS environment_proto DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION})

**add_executable(rosplay src/rosplay.cpp)
target_link_libraries(rosplay ${catkin_LIBRARIES} ${Boost_LIBRARIES}) 
install(TARGETS rosplay DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION})**

install(DIRECTORY launch DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION})
install ...