inline assignment of vectors

[foice]

why can't I make the same inline assignment for vectors?
float fp_values[] = { 0.1, 0.2 , 0.3, 0.4};

as for instance this
vector<float> v=(1.2, 3.3, 4.);

any idea how to do that in one line and for arbitrary lenght of the
initialization?

thanks roberto

 

[Vladimir Jovic]

why can't I make the same inline assignment for vectors?
float fp_values[] = { 0.1, 0.2 , 0.3, 0.4};

as for instance this
vector<float> v=(1.2, 3.3, 4.);

any idea how to do that in one line and for arbitrary lenght of the
initialization?

See here :

http://live.boost.org/doc/libs/1_36_0/libs/assign/doc/index.html

 

[foice]

why can't I make the same inline assignment for vectors?
float fp_values[] = { 0.1, 0.2 , 0.3, 0.4};

as for instance this
vector<float> v=(1.2, 3.3, 4.);

any idea how to do that in one line and for arbitrary lenght of the
initialization?

See here :

http://live.boost.org/doc/libs/1_36_0/libs/assign/doc/index.html

i see ... it's very interesting. though not standard

 

[Stuart Golodetz]

why can't I make the same inline assignment for vectors?
float fp_values[] = { 0.1, 0.2 , 0.3, 0.4};
as for instance this
vector<float> v=(1.2, 3.3, 4.);
any idea how to do that in one line and for arbitrary lenght of the
initialization?

See here :

http://live.boost.org/doc/libs/1_36_0/libs/assign/doc/index.html

i see ... it's very interesting. though not standard

It's portable, though, which is usually good enough

Stu

 

[Ángel José Riesgo]

why can't I make the same inline assignment for vectors?
float fp_values[] = { 0.1, 0.2 , 0.3, 0.4};

as for instance this
vector<float> v=(1.2, 3.3, 4.);

As others have mentioned, you can do that sort of thing in the
forthcoming C++ standard (C++0x). The correct syntax will be:

std::vector<float> v = {1.2f, 3.3f, 4.f};

I think the latest version of the GCC compiler already supports this
if you enable the experimental C++0x features.

any idea how to do that in one line and for arbitrary lenght of the
initialization?

In the current C++ standard (C++03), you can't do this in one line.
But if you can live with doing it in three lines, this is the way I do
it:

const float kVArray[] = {1.2f, 3.3f, 4.f};

const size_t kVArraySize = sizeof(kVArray) / sizeof(*kVArray);

std::vector<float> v(kVArray, kVArray + kVArraySize);

Hope this helps.

Ángel José Riesgo

 

[James Kanze]

why can't I make the same inline assignment for vectors?
float fp_values[] = { 0.1, 0.2 , 0.3, 0.4};
as for instance this
vector<float> v=(1.2, 3.3, 4.);

As others have mentioned, you can do that sort of thing in the
forthcoming C++ standard (C++0x). The correct syntax will be:

std::vector<float> v = {1.2f, 3.3f, 4.f};

I think the latest version of the GCC compiler already supports this
if you enable the experimental C++0x features.

In the current C++ standard (C++03), you can't do this in one line.
But if you can live with doing it in three lines, this is the way I do
it:

const float kVArray[] = {1.2f, 3.3f, 4.f};

const size_t kVArraySize = sizeof(kVArray) / sizeof(*kVArray);

std::vector<float> v(kVArray, kVArray + kVArraySize);

It's usual to define the template functions begin and end, so
you can write:

float const kvArray[] = { 1.2f, 3.3f, 4.f };
std::vector<float> v( begin( kvArray ), end( kvArray ) );