# CheckStructHasMember

Check if the given struct or class has the specified member variable

`CHECK_STRUCT_HAS_MEMBER`

      CHECK_STRUCT_HAS_MEMBER(<struct> <member> <header> <variable>
                              [LANGUAGE <language>])

      <struct> - the name of the struct or class you are interested in
      <member> - the member which existence you want to check
      <header> - the header(s) where the prototype should be declared
      <variable> - variable to store the result
      <language> - the compiler to use (C or CXX)

The following variables may be set before calling this macro to modify the way the check is run:

    CMAKE_REQUIRED_FLAGS = string of compile command line flags
    CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
    CMAKE_REQUIRED_INCLUDES = list of include directories
    CMAKE_REQUIRED_LINK_OPTIONS = list of options to pass to link command
    CMAKE_REQUIRED_LIBRARIES = list of libraries to link
    CMAKE_REQUIRED_QUIET = execute quietly without messages

Example:

    CHECK_STRUCT_HAS_MEMBER("struct timeval" tv_sec sys/select.h
                            HAVE_TIMEVAL_TV_SEC LANGUAGE C)