Reroot the exception hierarchy into a toplevel Exception class

As the alternatives are unfortunate for applications trying to catch
all library errors, and it seems deriving from std::runtime_error
causes problems with MSVC DLLs (GH #340)

Effectively reverts 2837e915d82e43

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/math/mp/mp_misc.cpp b/src/lib/math/mp/mp_misc.cpp
index 542b0509e..adf4a0a6b 100644
--- a/src/lib/math/mp/mp_misc.cpp
+++ b/src/lib/math/mp/mp_misc.cpp
@@ -43,7 +43,7 @@ s32bit bigint_cmp(const word x[], size_t x_size,
 word bigint_divop(word n1, word n0, word d)
    {
    if(d == 0)
-      throw std::runtime_error("bigint_divop divide by zero");
+      throw Exception("bigint_divop divide by zero");
 
    word high = n1 % d, quotient = 0;