scala - how to apply implicit conversion for implicit parameter? -


i want implicitly convert connection jdbc connection implicit connection parameter in sql method parameter. have code, throw compilation error.

class jdbcconnection  class connection(val connection: jdbcconnection) object connection {   implicit def connection2jdbcconnection(connection: connection) = connection.connection }  object db {   def withtransaction[a](block: (connection => a)) = block(new connection(new jdbcconnection)) }  object main {   def sql(query: string)(implicit connection: jdbcconnection) = println("sql:" + query)    def main(args: array[string]) = {     db.withtransaction { implicit connection =>       sql("hello world")     }   } }    error:(20, 10) not find implicit value parameter connection: jdbcconnection       sql("hello world")          ^ error:(20, 10) not enough arguments method sql: (implicit connection: jdbcconnection)unit. unspecified value parameter connection.       sql("hello world")

how can fix this?

i tried use parameter implicit still compilation error

class connection(val connection: jdbcconnection) object connection {   implicit def connection2jdbcconnection(implicit connection: connection) = connection.connection }   error:(20, 10) not enough arguments method sql: (implicit connection: jdbcconnection)unit. unspecified value parameter connection.       sql("hello world")          ^ error:(20, 10) not find implicit value parameter connection: jdbcconnection       sql("hello world")          ^

an implicit conversion takes explicit argument used if connection used explicitly. if want work implicitly, make connection2jdbcconnection take implicit connection: connection.


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