How much gas does msg.gas statement use?

Question

If I use msg.gas statement inside my contract, does executing that line itself need gas? If yes, how much does it need?

cqx · Accepted Answer · 2022-03-13 11:56:48Z

2

Please note that msg.gas is deprecated. You should use gasleft() if you are over version 0.4.21.

The function itself uses the gas opcode which is in the base group and thus costs 2 gas.

answered Mar 13, 2022 at 11:56

cqx

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hroussille · Accepted Answer · 2022-03-13 11:59:06Z

1

msg.gas was renamed to gasleft().

Anyway, everything has a cost, for gasleft() it is defined here. The associated cost is GasQuickStep which is set to 2.

It therefore cost you 2 gas to know how much gas is left.

answered Mar 13, 2022 at 11:59

hroussille

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