如何使用显式模板实例化来减少编译时间？ [英] How to use explicit template instantiation to reduce compilation time?

问题描述

建议使用显式模板实例化以减少编译时间。我想知道如何去做。例如

It was suggesting to use explicit template instantiation to reduce compilation time. I am wondering how to do it. For example

// a.h
template<typename T> class A {...};
template class A<int>; // explicit template instantiation  to reduce compilation time

但是在包含ah的每个翻译单元中，似乎 A< int> 将被编译。编译时间不会减少。如何使用显式模板实例化来减少编译时间？

But in every translation unit that a.h is included, it seems A<int> will be compiled. The compilation time is not reduced. How to use the explicit template instantiation to reduce compilation time?

推荐答案

如果您知道模板仅用于某些类型，
称为T1，T2，您可以将实现移到源文件中，就像普通类一样移至
。

If you know that your template will be used only for certain types, lets call them T1,T2, you can move implementation to source file, like normal classes.

//foo.hpp
template<typename T>
struct Foo {
    void f();
};

//foo.cpp
template<typename T>
void Foo<T>::f() {}

template class Foo<T1>;
template class Foo<T2>;

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