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abacus: bignum: add input operator

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This commit is contained in:
Bruno BELANYI 2021-08-20 19:00:53 +02:00
parent fe01661613
commit d40c109fb7
3 changed files with 54 additions and 0 deletions
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14
tests/unit/bignum.cc
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@ -24,6 +24,20 @@ TEST(BigNum, dump) {
EXPECT_EQ(to_str(forty_two), "42");
}
TEST(BigNum, read) {
auto const from_str = [](auto num) -> BigNum {
std::stringstream str(num);
BigNum res;
EXPECT_TRUE(str >> res);
return res;
};
EXPECT_EQ(from_str("0"), BigNum(0));
EXPECT_EQ(from_str("1"), BigNum(1));
EXPECT_EQ(from_str("-1"), BigNum(-1));
EXPECT_EQ(from_str("42"), BigNum(42));
}
TEST(BigNum, equality) {
auto const zero = BigNum(0);
auto const one = BigNum(1);