49 lines
896 B
C++
49 lines
896 B
C++
/*
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SPDX-License-Identifier: MIT
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Copyright © 2023 Amebis
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*/
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#pragma once
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#include "sal.hpp"
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#include "system.hpp"
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#include <stdexcept>
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namespace stdex
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{
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inline size_t mul(size_t a, size_t b)
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{
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#if _MSC_VER >= 1300
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SIZE_T result;
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if (SUCCEEDED(SIZETMult(a, b, &result)))
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return result;
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#elif defined(_MSC_VER)
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if (a == 0)
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return 0;
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if (b <= SIZE_MAX / a)
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return a * b;
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#else
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size_t result;
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if (!__builtin_mul_overflow(a, b, &result))
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return result;
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#endif
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throw std::invalid_argument("multiply overflow");
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}
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inline size_t add(size_t a, size_t b)
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{
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#if _MSC_VER >= 1300
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SIZE_T result;
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if (SUCCEEDED(SIZETAdd(a, b, &result)))
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return result;
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#elif defined(_MSC_VER)
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if (a <= SIZE_MAX - b)
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return a + b;
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#else
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size_t result;
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if (!__builtin_add_overflow(a, b, &result))
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return result;
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#endif
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throw std::invalid_argument("add overflow");
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}
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} |