mirror of https://github.com/bitcoin/bitcoin.git
45 lines
2.1 KiB
C++
45 lines
2.1 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2021 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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// Compile-time verification of assumptions we make.
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#ifndef BITCOIN_COMPAT_ASSUMPTIONS_H
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#define BITCOIN_COMPAT_ASSUMPTIONS_H
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#include <cstddef>
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#include <limits>
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// Assumption: We assume the floating-point types to fulfill the requirements of
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// IEC 559 (IEEE 754) standard.
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// Example(s): Floating-point division by zero in ConnectBlock, CreateTransaction
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// and EstimateMedianVal.
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static_assert(std::numeric_limits<float>::is_iec559, "IEEE 754 float assumed");
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static_assert(std::numeric_limits<double>::is_iec559, "IEEE 754 double assumed");
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// Assumption: We assume eight bits per byte (obviously, but remember: don't
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// trust -- verify!).
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// Example(s): Everywhere :-)
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static_assert(std::numeric_limits<unsigned char>::digits == 8, "8-bit byte assumed");
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// Assumption: We assume integer widths.
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// Example(s): GetSizeOfCompactSize and WriteCompactSize in the serialization
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// code.
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static_assert(sizeof(short) == 2, "16-bit short assumed");
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static_assert(sizeof(int) == 4, "32-bit int assumed");
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static_assert(sizeof(unsigned) == 4, "32-bit unsigned assumed");
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// Assumption: We assume size_t to be 32-bit or 64-bit.
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// Example(s): size_t assumed to be at least 32-bit in ecdsa_signature_parse_der_lax(...).
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// size_t assumed to be 32-bit or 64-bit in MallocUsage(...).
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static_assert(sizeof(size_t) == 4 || sizeof(size_t) == 8, "size_t assumed to be 32-bit or 64-bit");
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static_assert(sizeof(size_t) == sizeof(void*), "Sizes of size_t and void* assumed to be equal");
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// Some important things we are NOT assuming (non-exhaustive list):
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// * We are NOT assuming a specific value for std::endian::native.
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// * We are NOT assuming a specific value for std::locale("").name().
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// * We are NOT assuming a specific value for std::numeric_limits<char>::is_signed.
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#endif // BITCOIN_COMPAT_ASSUMPTIONS_H
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