mirror of
https://github.com/Light-City/CPlusPlusThings.git
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dfe1c933b3
- const README: rewrite the space-saving claim per issue #5 follow-ups (constant-expression const vs #define immediates; which const qualify as constant expressions) - const README: fix the class-section diagnosis per issue #338 (overload resolution picks the const overload; the restriction only surfaces once that overload is removed) - sizeof README: virtual-inheritance result is compiler-dependent (GCC merges vbptr+vfptr -> 16, MSVC keeps them separate -> 32) #246 - static README: new section on internal linkage / access restriction with anonymous-namespace comparison #142 - 10-day practice: full problem list table + fixed day links #136 - new design_pattern/singleton/singleton_default.hpp: reusable thread-safe CRTP singleton template, compile+concurrency tested #303
35 lines
1.0 KiB
Markdown
35 lines
1.0 KiB
Markdown
> 来自 [C++那些事网站](https://light-city.github.io/stories_things/cpp-idioms/class-template-over-function-template/) 的文章，由站点同步脚本导出。
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# C++ 类模板优于函数模板
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https://stackoverflow.com/questions/5688355/partial-specialisation-of-member-function-with-non-type-parameter
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最近看到一个很有意思的模版问题，看看大家对函数模版与类模版的基础掌握的如何，对于下面这个例子会出现什么问题？
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你一般使用什么方法进行修复？
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```cpp
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template <typename T, int R>
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struct foo {
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foo(const T& v) : value_(v) {}
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void bar() {
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std::cout << "Generic" << std::endl;
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for (int i = 0; i < R; ++i) std::cout << value_ << std::endl;
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}
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T value_;
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};
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template <>
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void foo<float, 3>::bar() {
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std::cout << "Float" << std::endl;
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for (int i = 0; i < 3; ++i) std::cout << value_ << std::endl;
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}
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template <int R>
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void foo<double, R>::bar() {
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std::cout << "Double" << std::endl;
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for (int i = 0; i < R; ++i) std::cout << value_ << std::endl;
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}
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``` |