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book: remove default template parameters (#194)

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2021-07-07 14:25:57 +08:00
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book/en-us/02-usability.md
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@@ -709,28 +709,6 @@ int main() {
}
```
### Default template parameters
We may have defined an addition function:
```cpp
template<typename T, typename U>
auto add(T x, U y) -> decltype(x+y) {
return x+y;
}
```
However, when used, it is found that to use add, you must specify the type of its template parameters each time.
A convenience is provided in C++11 to specify the default parameters of the template:
```cpp
template<typename T = int, typename U = int>
auto add(T x, U y) -> decltype(x+y) {
return x+y;
}
```
### Variadic templates
The template has always been one of C++'s unique **Black Magic**.