c++ - (VS2015) Attempting to fill a static map with data from initializer list -

i have class sorta like:

class object { public:     struct flag {         const uint32_t bit = 0;         const wchar_t* name = l"";         const wchar_t sign = l"";     }      static std::map<const char*, flag> flags; } 

i'm on vs2015, want support clang , gcc (the latest). problem is, can't figure out how initialize map data.

i tried putting inline, like:

static std::map<const char*, flag> flags = {     { "foo1",       { 0, l"foo1",       l'a' } },     { "foo2",       { 1, l"foo3",       l'b' } },     { "foo3",       { 2, l"foo3",       l'c' } } } 

but complained const integral types can in-class. okay! left declaration in class definition (as shown in first code snippet), , put in associated cpp:

static std::map<const char*, object::flag> object::flags = {     { "foo1",       { 0, l"foo1",       l'a' } },     { "foo2",       { 1, l"foo3",       l'b' } },     { "foo3",       { 2, l"foo3",       l'c' } } } 

now complains that:

error c2440: 'initializing': cannot convert 'initializer list' 'std::map,std::allocator>>'

the thing is, could've sworn i've had working, i'm thinking must have syntax wrong. if not, i'm missing how load static map classes namespace.

according c++11 standard, flag not aggregate due presence of brace-or-equal-initializers (aka default member initializers), attempting use aggregate initialization initialize fails. c++14 removed restriction, flag considered aggregate according version of standard, , your code valid.

here's simpler version of example fails compile -std=c++11, compiles -std=c++14.

#include <stdint.h>  struct flag {     const uint32_t bit = 0;     const wchar_t* name = l"";     const wchar_t sign = l' '; };  int main() {     flag f{ 0u, l"foo1", l'a' }; } 

live demo.

vs2015 still has c++11 behavior, options either remove default member initializers (thus making flag aggregate), or provide constructor object::flag.