fix __cplusplus check macro
fix __cplusplus check macro

fix __cplusplus check macro
SuperSodaSea/itoa-benchmark,SuperSodaSea/itoa-benchmark,miloyip/itoa-benchmark,miloyip/itoa-benchmark,SuperSodaSea/itoa-benchmark,miloyip/itoa-benchmark,miloyip/itoa-benchmark,SuperSodaSea/itoa-benchmark,miloyip/itoa-benchmark,SuperSodaSea/itoa-benchmark