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Ребят, не могу понять, как передаются аргументы в ф-цию sub

при записи:?
balanceOf[from] = balanceOf[from].sub(value);
balanceOf[from] уйдет как X аргумент, value - как Y аргумент ?
для:
function sub(uint x, uint y) internal pure returns (uint z) {
require((z = x - y) <= x, 'ds-math-sub-underflow');
}

6 ответов

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Nonono-Yes Автор вопроса

только у меня докан е грузится7)

Nonono-Yes Автор вопроса

спасибо, почитал. Пока так и не понял, как аргумент попадает в X))) res = sub(balance, value); - все понятно )))) res = balanceOf[from].sub(value); - не понятно

зачем ты используешь safemath?

Nonono-Yes Автор вопроса
Sam Becket
зачем ты используешь safemath?

a library for performing overflow-safe math

Nonono Yes
a library for performing overflow-safe math

если solidity версии 0.8.x, то safemath работает из коробки

Sam Becket
зачем ты используешь safemath?

Кстати нашел для себя полезной safeMath в 0.8.* из-за внятных сообщений при реверте

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