You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
50 lines
2.1 KiB
50 lines
2.1 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto
|
|
// Copyright (c) 2009-2019 The Bitcoin Core developers
|
|
// Distributed under the MIT software license, see the accompanying
|
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
|
|
|
// Compile-time verification of assumptions we make.
|
|
|
|
#ifndef BITCOIN_COMPAT_ASSUMPTIONS_H
|
|
#define BITCOIN_COMPAT_ASSUMPTIONS_H
|
|
|
|
#include <limits>
|
|
|
|
// Assumption: We assume that the macro NDEBUG is not defined.
|
|
// Example(s): We use assert(...) extensively with the assumption of it never
|
|
// being a noop at runtime.
|
|
#if defined(NDEBUG)
|
|
# error "Litecoin cannot be compiled without assertions."
|
|
#endif
|
|
|
|
// Assumption: We assume the floating-point types to fulfill the requirements of
|
|
// IEC 559 (IEEE 754) standard.
|
|
// Example(s): Floating-point division by zero in ConnectBlock, CreateTransaction
|
|
// and EstimateMedianVal.
|
|
static_assert(std::numeric_limits<float>::is_iec559, "IEEE 754 float assumed");
|
|
static_assert(std::numeric_limits<double>::is_iec559, "IEEE 754 double assumed");
|
|
|
|
// Assumption: We assume eight bits per byte (obviously, but remember: don't
|
|
// trust -- verify!).
|
|
// Example(s): Everywhere :-)
|
|
static_assert(std::numeric_limits<unsigned char>::digits == 8, "8-bit byte assumed");
|
|
|
|
// Assumption: We assume floating-point widths.
|
|
// Example(s): Type punning in serialization code (ser_{float,double}_to_uint{32,64}).
|
|
static_assert(sizeof(float) == 4, "32-bit float assumed");
|
|
static_assert(sizeof(double) == 8, "64-bit double assumed");
|
|
|
|
// Assumption: We assume integer widths.
|
|
// Example(s): GetSizeOfCompactSize and WriteCompactSize in the serialization
|
|
// code.
|
|
static_assert(sizeof(short) == 2, "16-bit short assumed");
|
|
static_assert(sizeof(int) == 4, "32-bit int assumed");
|
|
|
|
// Some important things we are NOT assuming (non-exhaustive list):
|
|
// * We are NOT assuming a specific value for sizeof(std::size_t).
|
|
// * We are NOT assuming a specific value for std::endian::native.
|
|
// * We are NOT assuming a specific value for std::locale("").name().
|
|
// * We are NOT assuming a specific value for std::numeric_limits<char>::is_signed.
|
|
|
|
#endif // BITCOIN_COMPAT_ASSUMPTIONS_H
|