Question

如果我这样做：

(gdb) b nmspace::TestClass::compareFOO

然后将以下方法签名作为断点签名：

nmspace::TestClass::compareFOO(blah::Foo const&, blah::Foo const&, unsigned int)
nmspace::TestClass::compareFOO(blah::Foo const&, blah::FooField const&, unsigned int)
nmspace::TestClass::compareFOO(blah::FooField const&, blah::Foo const&, unsigned int)
nmspace::TestClass::compareFOO(blah::FooField const&, blah::FooField const&, unsigned int)

是否有类似于以下的内容，或者我们必须每次都为模板方法编写四个？多态性是否也适用于C ++模板？

nmspace::TestClass::compareFOOES<blah::Foo, blah::Foo>
nmspace::TestClass::compareFOOES<blah::Foo, blah::FooField>
nmspace::TestClass::compareFOOES<blah::FooField, blah::Foo>
nmspace::TestClass::compareFOOES<blah::FooField, blah::FooField>

我已尝试nmspace::TestClass::compareFOOES，nmspace::TestClass::compareFOOES*，nmspace::TestClass::compareFOOES<>()等。

Answer 1

如果所有函数的主体相同，您可以编写一个可以使用std::enable_if或boost::enable_if接受多种类型参数的全局函数：

template< class T >
struct is_valid_field
    : boost::or_<boost::is_same<T, blah::Foo>, boost::is_same<T, blah::FooField>>
{
};

template< class T, class Q >
nmspace::TestClass::compareFOO(T const&, Q const&, unsigned int,
    typename boost::enable_if<
        boost::and_<is_valid_field<T>, is_valid_field<Q>
    >::type* = 0)
{
    // implementation
}

如何非模板断点多个C ++模板方法？

1 个答案: