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Add operator bool to modint #169
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Signed-off-by: szdytom <[email protected]>
95a6273 For conversion rules between bool and int types in the C++ language, https://timsong-cpp.github.io/cppwp/n4659/conv.prom#6
https://timsong-cpp.github.io/cppwp/n4659/conv.bool#1
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it is preferred to make conversion function explicit unless any reason not to do so.
This is the place where we need implicit conversion. no one wants to write |
You can write cf. https://en.cppreference.com/w/cpp/language/implicit_conversion#Contextual_conversions |
This repository does not accept requests for new features.
In this case, I don't think it's necessary because you can add a custom bool cast as shown below: #include <atcoder/modint>
#include <bits/stdc++.h>
struct mint : public modint998244353 {
using static_modint::static_modint;
mint(modint998244353 m) : modint998244353 (m) {}
operator bool() const { return val() != 0; }
};
int main() {
mint m(123);
if (m) {
puts("not zero");
} else {
puts("zero");
}
} |
It can be useful if you want something like: