Item 7 : why not specialize function templates 条款7 :为什么不特化函数模板?
A function template is like an extension to a user - defined function 函数模板就像是用户定义函数的一个扩展。
For the create function statement extension for function templates , refer to the 要了解函数模板的create function语句扩展,请参阅
Shows the issues to consider in determining when a function template needs to be registered 展示了在决定何时需要注册函数模板时所考虑的问题。
It is required to allow queries to reference those functions on the data source that do not have corresponding functions on the federated server 为了允许查询在联邦服务器上没有相应函数的数据源上引用那些函数,就需要函数模板。
When a query references a function template , the query optimizer tries to generate a feasible plan that allows this function reference to be evaluated on the remote data source 当一个查询引用一个函数模板时,查询优化器尝试生成一个灵活的计划,允许在远程数据源上计算这个函数引用。
If there is some special function specific to a data source and not available on websphere information integrator , you need a function template definition for that function 如果存在特定于某个数据源的、在websphere information integrator上没有的特殊函数,则需要那个函数的函数模板定义。
For functions , function templates , objects , and values , the library clauses specify declarations . implementations shall supply definitions consistent with the descriptions in the library clauses 对于函数,函数模板,对象和值,库条款规定了它们的声明。实现应该提供与库条款的描述一致的定义。
For functions , function templates , objects , and values , the library clauses specify declarations . implementations shall supply definitions consistent with the descriptions in the library clauses 对于函数,函数模板,对象和值,库章节规定了它们的声明。每个实现都应该提供与标准库章节的描述一致的定义。
For functions , function templates , objects , and values , the library clauses specify declarations . implementations shall supply definitions consistent with the descriptions in the library clauses 对于函数,函数模板,对象和值,标准库章节规定了它们的声明。每个实现都应该提供与标准库章节的描述一致的定义。