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examples: Better get_block_hash example

This commit is contained in:
Paweł Bylica 2018-09-03 17:24:15 +02:00
parent d0bc50792a
commit ced1c2676f
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GPG Key ID: 7A0C037434FE77EF
1 changed files with 17 additions and 8 deletions
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25
examples/example_host.cpp
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@ -9,6 +9,13 @@
#include <evmc/helpers.h>
struct example_host_context : evmc_context
{
example_host_context();
evmc_tx_context tx_context = {};
};
static evmc_uint256be balance(evmc_context* context, const evmc_address* address)
{
(void)context;
@ -109,10 +116,15 @@ static evmc_tx_context get_tx_context(evmc_context* context)
static int get_block_hash(evmc_uint256be* result, evmc_context* context, int64_t number)
{
(void)result;
(void)context;
(void)number;
return 0;
example_host_context* host = static_cast<example_host_context*>(context);
int64_t current_block_number = host->tx_context.block_number;
if (number >= current_block_number || number < current_block_number - 256)
return 0;
evmc_uint256be example_block_hash{};
*result = example_block_hash;
return 1;
}
static void emit_log(evmc_context* context,
@ -135,10 +147,7 @@ static const evmc_host_interface interface = {
copy_code, selfdestruct, call, get_tx_context, get_block_hash, emit_log,
};
struct example_host_context : evmc_context
{
example_host_context() : evmc_context{&interface} {}
};
example_host_context::example_host_context() : evmc_context{&interface} {}
extern "C" {