Listing 9.3 - Compile Error #48
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- opted for version that returns type _Tp - - void version in book takes three arguments - - _Tp version in book takes two
- struct called without arguments - add arguments according to earlier operator() definition
- book passes accumulate_block as part of a lambda function
- accumulate_block::operator() returns type _Tp - we must call `return` on the struct's call inside the lambda to capture this return type - without this, the code will fail to compile, and provide the following error: - - "No viable overloaded '='"
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A
returnis needed when calling the two-parameter version ofaccumulate_block()inside of the lambda function.futures[i] = pool.submit([=] () { - accumulate_block<_ForwardIt, _Tp>()(block_start, block_end); + return accumulate_block<_ForwardIt, _Tp>()(block_start, block_end); });Without it, we receive the following error:
No viable overloaded '='The listing in this repo (here) also doesn't mirror what was written in the book, so I've first brought them in sync before applying the correction.