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feat: add strict_* family for safe numeric op.

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- add strict_* function family for same numeric operation. this function family recently become stable in Rust.
- add corresponding test.
This commit is contained in:
yyc12345
2025-12-19 09:44:22 +08:00
parent fece224ec5
commit 5993ae59c0
2 changed files with 158 additions and 1 deletions
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83
test/yycc/num/safe_op.cpp
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@@ -155,6 +155,89 @@ namespace yycctest::num::safe_op {
#pragma endregion
#pragma region Strict operations
TEST(NumSafeOp, StrictAdd) {
// Unsigned
{
auto rv = OP::strict_add<u32>(MAX<u32> - 2, 1);
EXPECT_EQ(rv, MAX<u32> - 1);
}
{
EXPECT_ANY_THROW(OP::strict_add<u32>(MAX<u32> - 2, 3));
}
// Signed
{
auto rv = OP::strict_add<i32>(MAX<i32> - 2, 1);
EXPECT_EQ(rv, MAX<i32> - 1);
}
{
EXPECT_ANY_THROW(OP::strict_add<i32>(MAX<i32> - 2, 3));
}
}
TEST(NumSafeOp, StrictSub) {
// Unsigned
{
auto rv = OP::strict_sub<u32>(1, 1);
EXPECT_EQ(rv, 0);
}
{
EXPECT_ANY_THROW(OP::strict_sub<u32>(0, 1));
}
// Signed
{
auto rv = OP::strict_sub<i32>(MIN<i32> + 2, 1);
EXPECT_EQ(rv, MIN<i32> + 1);
}
{
EXPECT_ANY_THROW(OP::strict_sub<i32>(MIN<i32> + 2, 3));
}
}
TEST(NumSafeOp, StrictMul) {
// Unsigned
{
auto rv = OP::strict_mul<u32>(5, 1);
EXPECT_EQ(rv, 5);
}
{
EXPECT_ANY_THROW(OP::strict_mul<u32>(MAX<u32>, 2));
}
// Signed
{
auto rv = OP::strict_mul<i32>(MAX<i32>, 1);
EXPECT_EQ(rv, MAX<i32>);
}
{
EXPECT_ANY_THROW(OP::strict_mul<i32>(MAX<i32>, 2));
}
}
TEST(NumSafeOp, StrictDiv) {
// Unsigned
{
auto rv = OP::strict_div<u32>(128, 2);
EXPECT_EQ(rv, 64);
}
{
EXPECT_ANY_THROW(OP::strict_div<u32>(1, 0));
}
// Signed
{
auto rv = OP::strict_div<i32>(MIN<i32> + 1, -1);
EXPECT_EQ(rv, INT32_C(2147483647));
}
{
EXPECT_ANY_THROW(OP::strict_div<i32>(MIN<i32>, -1));
}
{
EXPECT_ANY_THROW(OP::strict_div<i32>(1, 0));
}
}
#pragma endregion
#pragma region Overflowing operations
TEST(NumSafeOp, OverflowingAdd) {