[英]How to optimize variadic template specializations?
Suppose you have the following struct to concatenate two templated structs:假设您有以下结构来连接两个模板化结构:
/// concat.hpp
template<typename...>
struct concat_struct;
// concat_specialization.hpp
template<std::size_t... m, std::size_t... n>
struct concat_struct<$CLASSNAME<m...>, $CLASSNAME<n...>>
{
using type = $CLASSNAME<m..., n...>;
};
template<typename a, typename b>
using concat = typename concat_struct<a, b>::type;
I can now do我现在可以
#include "concat.hpp"
#define $CLASSNAME MyClass
#include "concat_specialization.hpp"
#undefine $CLASSNAME
#define $CLASSNAME MyOtherClass
#include "concat_specialization.hpp"
As is, this could easily lead to conflicts, if I were to include "concat_specialization.hpp" again.事实上,如果我再次包含“concat_specialization.hpp”,这很容易导致冲突。 What is the C++ way, to handle multiple specializations of variadic templates?
什么是 C++ 方式来处理可变参数模板的多个专业化?
You don't need to explicitly write out a specialization for each $CLASSNAME
.您不需要为每个
$CLASSNAME
明确写出专门化。 You can just add a template template parameter to the specialization, and this will get deduced automatically:您只需将模板模板参数添加到专业化中,这将自动推导出:
template<template<std::size_t...> typename C, std::size_t... m, std::size_t... n>
struct concat_struct<C<m...>, C<n...>>
{
using type = C<m..., n...>;
};
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