hi
VS2015 (update pack 3) compiler produced own copy of these constants in
each object file:
constexpr BitCount BITS = kj::unit<BitCount>();
constexpr ByteCount BYTES = kj::unit<ByteCount>();
constexpr WordCount WORDS = kj::unit<WordCount>();
constexpr ElementCount ELEMENTS = kj::unit<ElementCount>();
constexpr WirePointerCount POINTERS = kj::unit<WirePointerCount>();
As example map file of resulted binary tell me that I have 22 copies of
capnp::BITS in it. 88 bytes is not a big deal, but... it's a bit inaccurate
)
And this happens when the header visible to just 17 my cpp files. And a cpp
file doesn't need even use a constant - include the header enough for
produce variable in the object file.
As I understand you use it for special types in DEBUG build.
But can it be a bit more trivial for RELEASE?
I tried simple project with the header:
namespace kj
{
template <typename T>
inline constexpr T unit() { return T(1); }
inline constexpr unsigned int unit3() { return 1; }
}
namespace capnp
{
typedef unsigned int uint;
typedef uint BitCount;
constexpr BitCount BITS1 = kj::unit<BitCount>();
constexpr BitCount BITS2 = 1;
constexpr BitCount BITS3 = kj::unit3();
}
all 3 constants have value 1. and all 3 properly can be used as size of an
array
#include "Header.h"
void f();
int main()
{
int b1[capnp::BITS1] = {};
int b2[capnp::BITS2] = {};
int b3[capnp::BITS3] = {};
f();
printf("1=%d 2=%d 3=%d\n", capnp::BITS1, capnp::BITS2, capnp::BITS3);
return 0;
}
but the map file is:
3 .bss 62c 4 unsigned int const capnp::BITS1 ConsoleApplication1.obj
?BITS1@capnp@@3IB
3 .bss 630 4 unsigned int const capnp::BITS3 ConsoleApplication1.obj
?BITS3@capnp@@3IB
3 .bss 634 4 unsigned int const capnp::BITS1 Source.obj ?BITS1@capnp@@3IB
3 .bss 638 8 unsigned int const capnp::BITS3 Source.obj ?BITS1@capnp@@3IB
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